## Is c always the speed of light?

$c=\lambda v$

Savannah Torella 1L
Posts: 52
Joined: Wed Sep 30, 2020 9:40 pm

### Is c always the speed of light?

When using the equation E= hc/ wavelength, is c always going to be the speed of light constant? Are there any instances were c is a different variable?

Meghan Krushena 2E
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Joined: Wed Sep 30, 2020 10:10 pm

### Re: Is c always the speed of light?

As far as we have learned (unless someone correct me if I am wrong), c is a constant that will always be the set number equal to the speed of light. A constant is an unchanging number, thus c will always be the same value and will always represent that value as the speed of light. The only possibility I can think of as to why c might be a different number is if it undergoes a conversion factor to fit the specific question being asked, but the starting number would still be the same value of c.

Nico Medina
Posts: 48
Joined: Wed Sep 30, 2020 9:33 pm

### Re: Is c always the speed of light?

For our purposes, it will always be the speed of light. Hope this helps!

Fernanda Olvera 3D
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### Re: Is c always the speed of light?

From what I understood, I agree with both Meghan and Nico, C will always be the speed of light constant.

Caelin Brenninkmeijer 1G
Posts: 90
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### Re: Is c always the speed of light?

Since in class "c" has remained the constant for speed of light, I think it's safe to assume that whenever we'd encounter c in a problem/equation that it'd be used as a constant. I think Dr. Lavelle would've specified otherwise if that was the case!

Tobie Jessup 2E
Posts: 89
Joined: Wed Sep 30, 2020 10:02 pm

### Re: Is c always the speed of light?

From what I understand, the speed of light is always said to be constant c. c is also the fastest speed, so it is telling if an answer to a question is more than the speed of light because it must be incorrect.

Rayna Irving 2C
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### Re: Is c always the speed of light?

I agree with everyone above, from what we have learned so far, c is always a constant used in equations to represent the speed of light.

vuongnaomi1L
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### Re: Is c always the speed of light?

Based on what we've learned so far, C would be the speed of light unless the question otherwise specifies

Ethan Goode 2H
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### Re: Is c always the speed of light?

It seems C will always be the constant of the speed of light, which is indicated on Dr. Lavelle's formula sheet.

jordanginyard_
Posts: 81
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### Re: Is c always the speed of light?

yes, C will always represent the speed of the light (3x10^8).

Marco Vivar 3G
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### Re: Is c always the speed of light?

Yes so far C is always light which is a constant at 3*10^8 power. Unless they tell us otherwise

IshanModiDis2L
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### Re: Is c always the speed of light?

C is a constant that will not change and it is 3.00x^8

Inderpal Singh 2L
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### Re: Is c always the speed of light?

C will be equal to 3*10^8.

Keeryth Sandhu 1H
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### Re: Is c always the speed of light?

Yes, c is equal to the speed of light and is constant.

Jonathan Batac - 2D
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Joined: Wed Sep 30, 2020 10:03 pm

### Re: Is c always the speed of light?

Lavelle emphasized that c is a constant. In the equation c=wavelength.frequency, c is the constant and should always be the speed of light.

Lorraine Medina 3E
Posts: 125
Joined: Wed Sep 30, 2020 10:11 pm

### Re: Is c always the speed of light?

The constant c is the speed of light, 2.99792 x 10^8 m/s, as indicated on the equation sheet.

Posts: 98
Joined: Wed Sep 30, 2020 9:51 pm

### Re: Is c always the speed of light?

From all the material we've covered, c is always going to be a constant (the speed of light), 2.998x10^8 m/s. In the future maybe there will be another variable, c, that could also be another constant, but until now, just know that its the speed of light!

Brenda Silva 1B
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### Re: Is c always the speed of light?

Based on what we have learned so far, c will be the speed of light constant (2.998x10^8 m/s).

Victoria Dao 3G
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Joined: Wed Sep 30, 2020 9:50 pm

### Re: Is c always the speed of light?

For our purposes and for the equations we know already, yes, C will always be equal to the speed of light, or 3x10^8 m/s. Hope this helps!

Gigi Elizarraras 2C
Posts: 90
Joined: Wed Sep 30, 2020 9:41 pm

### Re: Is c always the speed of light?

C is a constant in the equation such as "h"=6.626*10^-34. So I would continue using the constant as 3*10^8 for the purposes of our use. But as far as momentum equation(p=mv) the velocity changes.

Kathy_Li_1H
Posts: 90
Joined: Wed Sep 30, 2020 9:31 pm

### Re: Is c always the speed of light?

In this class, I believe we only need to know c as the speed of light (given as 2.998E-8 m/s on the reference sheet).

Megan ODonnell 3F
Posts: 91
Joined: Wed Sep 30, 2020 9:39 pm

### Re: Is c always the speed of light?

We have only used c as the speed of light so far!

Moura Girgis 1F
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Joined: Wed Sep 30, 2020 10:00 pm

### Re: Is c always the speed of light?

Yes! At least so far in Chem14A c is always a constant which represents the speed of light, so it should not change.

YUNALEE
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### Re: Is c always the speed of light?

Yes, it is because it is a constant!

Violet Kwan 3H
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### Re: Is c always the speed of light?

Yes it is always the speed of light. It is given to us on the formula sheet as 2.99792 x 10^8, so just use that every time you see the variable or need to use the speed of light in calculations :)

Yu Jin Kwon 3L
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### Re: Is c always the speed of light?

Yes, C is the speed of light (a constant). In addition, it's important to note that C is the speed of all the electromagnetic radiation that we've learned thus far (radio, infrared, visible, UV, x-ray, gamma-ray), meaning that the frequency or wavelength does not impact the speed of light; it is always a constant.

Brianna Chen 3F
Posts: 98
Joined: Wed Sep 30, 2020 10:11 pm

### Re: Is c always the speed of light?

Yes, so far in this class, we have only learned that c is equal to the speed of light (3.00x10^8 m/s).

Lauren Strickland 1B
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Joined: Wed Sep 30, 2020 9:47 pm

### Re: Is c always the speed of light?

Yes for this class c is the speed of light.

Nathan Chu 3H
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Joined: Wed Sep 30, 2020 9:48 pm

### Re: Is c always the speed of light?

According to the formula and constant sheet on the class website, c will always be the speed of light for the purposes of this class. However, there is another constant "C^2" that is called the second radiation constant.

Andrew Yoon 3L
Posts: 92
Joined: Wed Sep 30, 2020 9:36 pm

### Re: Is c always the speed of light?

For now, c will always be equal to the speed of light, which is 3x10^8 m/s.

Posts: 53
Joined: Wed Sep 30, 2020 9:33 pm

### Re: Is c always the speed of light?

All we need to know for this class is that c=speed of light= 3.0x10^8

Navdha Sharma 3J
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Joined: Wed Sep 30, 2020 9:46 pm

### Re: Is c always the speed of light?

This class requires us to know c as the speed light which is 3 X 10^8 m/s

Jonathan Banh 1G
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### Re: Is c always the speed of light?

In reference to the equation $E=\frac{hc}{\lambda }$, the variable c should always be representative of the speed of light. The speed of light, c, is generally approximated to 3.00*10^8 m/s, however, more accurately is 2.99792*10^8 m/s. In terms of other cases where c is a considered a different variable, I would think those would be beyond the scope of the case, but I am not too sure. For now, I think there is no need to worry about c being another variable.

James Patanian 2C
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Joined: Wed Sep 30, 2020 9:55 pm

### Re: Is c always the speed of light?

C is the speed of light in a vacuum and for practical purposes for doing calculations in 14a, I’m assuming we will say that it is the speed of light in any case.

Kiara Phillips 3L
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Joined: Wed Sep 30, 2020 10:04 pm

### Re: Is c always the speed of light?

For our purposes, yes. Speed will always be C or 3*10^8 :).

Gian Boco 2G
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### Re: Is c always the speed of light?

Yep, and it will always equal wavelength * frequency when taken from the EM spectrum

Simi Kapila_3E
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### Re: Is c always the speed of light?

Yes for us, c will always be synonymous with speed of light.

Tatyana Bonnet 2H
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### Re: Is c always the speed of light?

Yes c will always be the speed of light as its a constant. C=wavelengthxfrequency

Sukhkiran Kaur 3I
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Joined: Wed Sep 30, 2020 10:03 pm

### Re: Is c always the speed of light?

For us, yes, c will always equal the speed of light.

Isabella Cortes 2H
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Joined: Wed Sep 30, 2020 9:37 pm

### Re: Is c always the speed of light?

For our purposes, I believe that "c" will always be the speed of light

Will Skinner
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Joined: Wed Sep 30, 2020 9:28 pm

### Re: Is c always the speed of light?

C is the speed of light in a vacuum. Light traveling through air is a bit slower.

Catherine Bubser 2C
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Joined: Wed Sep 30, 2020 9:45 pm

### Re: Is c always the speed of light?

Is there a specific constant for the speed of light through air or should we always assume to use c even if it is not stated a vacuum is present in the equation?

805377003
Posts: 102
Joined: Wed Sep 30, 2020 10:10 pm

### Re: Is c always the speed of light?

I believe so since it is a constant.

MMorcus2E
Posts: 96
Joined: Wed Sep 30, 2020 9:47 pm

### Re: Is c always the speed of light?

Yes, c is the speed of light. I originally had the same question too, but since this equation solves for the energy of a photon, which is basically a tiny package of light energy which travels at the speed of light, then c would have to be the speed of light.

Jonathan Malau 1F
Posts: 82
Joined: Wed Sep 30, 2020 9:31 pm

### Re: Is c always the speed of light?

Based on the equation c=λv, c is always the speed of light.

Kat Stahl 2K
Posts: 92
Joined: Wed Sep 30, 2020 10:03 pm

### Re: Is c always the speed of light?

In this class I think that c will only be used to represent speed of light yes.

DPatel_2L
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### Re: Is c always the speed of light?

For our uses yes it is.

Charmaine Ng 2D
Posts: 98
Joined: Wed Sep 30, 2020 9:37 pm

### Re: Is c always the speed of light?

In this class at least, c will always be the speed of light! :))

simona_krasnegor_1C
Posts: 50
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### Re: Is c always the speed of light?

As stated before, c is the speed of light always!

Namratha Gujje
Posts: 95
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### Re: Is c always the speed of light?

Yes, for this equation c will always be the speed of light.

LovepreetSran_3H
Posts: 76
Joined: Wed Sep 30, 2020 9:33 pm

### Re: Is c always the speed of light?

Yes, c will always be the speed of light.

Melanie Krahn 1C
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Joined: Wed Sep 30, 2020 9:34 pm

### Re: Is c always the speed of light?

C always equals the speed of light, it will never equal another variable when doing the work we do.

Sheryl Ocampo 1D
Posts: 91
Joined: Wed Sep 30, 2020 10:09 pm

### Re: Is c always the speed of light?

yes, c is always the speed of light, it doesn't vary

sabrina ghalambor 2J
Posts: 98
Joined: Wed Sep 30, 2020 9:35 pm

### Re: Is c always the speed of light?

yes, c is a constant always equal to 3 x 10^8 m/s

josephspindler2H
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### Re: Is c always the speed of light?

Yes, the constant c will remain a constant 2.99792 x 10^8 m/s. c will always refer to the speed of light for the purposes of our classes (as far as I am aware).

Diana Aguilar 3H
Posts: 90
Joined: Wed Sep 30, 2020 9:50 pm

### Re: Is c always the speed of light?

Yes, like everyone else has stated, C is always going to represent the speed of light.

Posts: 93
Joined: Wed Sep 30, 2020 9:38 pm

### Re: Is c always the speed of light?

Yes, c will always be the speed of light. It is constant, after all. The reason why it is a constant is due to the inverse relationship between wavelength and frequency. Whenever you double wavelength, you are halving the frequency, and when you multiply these two values together, you will always obtain the speed of light (3.00x10^8 m/s).

TiffanyBrownfield 2I
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### Re: Is c always the speed of light?

Like what everyone else is saying, c is a variable specific to the speed of light. If velocity were supposed to be another value, it would typically be expressed with the variable (v).

jia207
Posts: 101
Joined: Wed Sep 30, 2020 9:52 pm

### Re: Is c always the speed of light?

Yes, c will always be the speed of light. The full length number for c can be found on his equation sheet.

Yolanda_Xing_3A
Posts: 43
Joined: Wed Sep 30, 2020 9:52 pm

### Re: Is c always the speed of light?

yes, light is always 3x10^8 m/s in vacuum

Anastasia Yulo 1C
Posts: 90
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### Re: Is c always the speed of light?

In this class, you can always count on c being the speed of light.

Sabrina Galvan 3J
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### Re: Is c always the speed of light?

Yes, and it will always be the product of the wavelength and frequency.

Rachel Kho Disc 2G
Posts: 79
Joined: Wed Sep 30, 2020 9:46 pm

### Re: Is c always the speed of light?

Yes, c is a constant equal to 3*10^8 m/s, and it is commonly used in equations c=(lambda)(nu)...in other words, wavelength*frequency. Another side note: the speed of light is lower case c. Please do not confuse it with C as in Celsius or C as in carbon!

Joanna Huang
Posts: 92
Joined: Wed Sep 30, 2020 9:40 pm

### Re: Is c always the speed of light?

Yep, c in chemistry will always be known as the constant for the speed of light.

Posts: 94
Joined: Wed Sep 30, 2020 9:40 pm

### Re: Is c always the speed of light?

The speed of light will always be represented by c (so far as I know!). However, the actual speed of light changes depending on what material it travels through. The constant c is the speed of light in a vacuum, but it will change if it's going through a different material.

Juliana Rosales 1H
Posts: 105
Joined: Wed Sep 30, 2020 9:43 pm

### Re: Is c always the speed of light?

yes. Its either going to be that one constant, or you'll be given the info to calculate whatever number they want you to

Dane_Beasley_1E
Posts: 68
Joined: Wed Sep 30, 2020 9:42 pm

### Re: Is c always the speed of light?

Yes, I do believe that the speed of light will always be represented as the constant c.

Bai Rong Lin 2K
Posts: 91
Joined: Wed Sep 30, 2020 9:54 pm

### Re: Is c always the speed of light?

Savannah Torella 1L wrote:When using the equation E= hc/ wavelength, is c always going to be the speed of light constant? Are there any instances were c is a different variable?

I think based on this class, it would always be used for speed.

Teti Omilana 1G
Posts: 82
Joined: Wed Sep 30, 2020 10:05 pm

### Re: Is c always the speed of light?

Yes, the constant c is always going to represent the speed of light in that equation. (c=3x10^8 m/s)

Sam Wentzel 1F 14B
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### Re: Is c always the speed of light?

c will always be equal to the speed of light. The speed of light does not change in a vacuum, unless acted upon by gravity. In the c = lambda nu equation, we assume we are in a vacuum with negligible gravitational force acting on the light.

Hope this helps!

Mehreen 3I
Posts: 85
Joined: Wed Sep 30, 2020 9:36 pm

### Re: Is c always the speed of light?

C will always be the speed of light :)

105618850
Posts: 59
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### Re: Is c always the speed of light?

I believe it is safe to say that the only constant c we will be encountering for the time being will concern the speed of light.

Megan Hulsy 1A
Posts: 114
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### Re: Is c always the speed of light?

Yes, it is a constant and is the speed of light.

CesarLec1
Posts: 67
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### Re: Is c always the speed of light?

Based on the formulas and constants sheet, c in this class will stand for the speed of light.

Posts: 93
Joined: Wed Sep 30, 2020 9:31 pm

### Re: Is c always the speed of light?

c is always the speed of light as long as it is in a vacuum. If it is the speed of light not it a vacuum, then it varies.

David Liu 1E
Posts: 90
Joined: Wed Sep 30, 2020 10:07 pm

### Re: Is c always the speed of light?

for this class c is always the constant value for speed of light!

Yuehan_Wu_3K
Posts: 52
Joined: Wed Sep 30, 2020 9:41 pm

### Re: Is c always the speed of light?

Yes I think for what we've learnd so far, c is always the speed of light.

Arnav Saud 2C
Posts: 117
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### Re: Is c always the speed of light?

c will always be the constant for the speed of light(at least for this class).

Joanne Yuh 3I
Posts: 103
Joined: Wed Sep 30, 2020 9:42 pm

### Re: Is c always the speed of light?

Yes, c is always the speed of light and it will not change based on the topics we have learned so far. The wavelength and frequency values will change to equal to the speed of light.

Posts: 50
Joined: Wed Sep 30, 2020 10:01 pm

### Re: Is c always the speed of light?

since the speed of light is a constant (c) it will always be the same number

Posts: 94
Joined: Wed Sep 30, 2020 9:40 pm

### Re: Is c always the speed of light?

In this class, c will always be the speed of light. Although this is technically the speed of light in a vacuum and light will travel slower through other substances, in this class we will just use this optimal maximum value.

Simran Bains 2C
Posts: 97
Joined: Wed Sep 30, 2020 9:36 pm

### Re: Is c always the speed of light?

From what we have learned I believe c is always the speed of light.

AHUNT_1A
Posts: 110
Joined: Wed Sep 30, 2020 9:41 pm

### Re: Is c always the speed of light?

Yes c is always the speed of light.

Jeremy Wei 2C
Posts: 78
Joined: Wed Sep 30, 2020 9:59 pm

### Re: Is c always the speed of light?

Yeah I believe c will always be the speed of light!

Brandon Gruender 3F
Posts: 91
Joined: Wed Sep 30, 2020 10:03 pm

### Re: Is c always the speed of light?

In this case, this will only be the speed of light. It may change in future classes (I'm not sure), but for now this is the speed of light. The constant is around 3 x 10^8

Carly_Lipschitz_3H
Posts: 93
Joined: Wed Sep 30, 2020 9:56 pm

### Re: Is c always the speed of light?

When using the equation E=hc/wavelength, c is always going to be the speed of the light constant. This constant is approximately 3 x 10^8 m/s. There are no instances in E=hc/wavelength for which c will be a different variable.

Brian Acevedo 3H
Posts: 20
Joined: Wed Sep 30, 2020 9:44 pm

### Re: Is c always the speed of light?

In the context of this class, the constant "c" will always refer to the speed of light, which is approximately 2.99792 x 108 meters per second.

Simrah_Ahmed1J
Posts: 88
Joined: Wed Sep 30, 2020 9:49 pm

### Re: Is c always the speed of light?

Yes, I think you can be completely sure to use c when you're talking about energy because it is in the form of photons and it is always light and therefore always has the speed c.

Jaclyn Schwartz 1I
Posts: 101
Joined: Wed Sep 30, 2020 9:45 pm

### Re: Is c always the speed of light?

For this course, c will always be a constant and represent the speed of light