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### Speed of Light

Posted: Sun Oct 14, 2018 1:54 am
Is speed of light a constant (3*10^8) or does it ever change?

### Re: Speed of Light clarissa nava 3H

Posted: Sun Oct 14, 2018 3:40 am
It does not change it will always be 3*10^8

### Re: Speed of Light

Posted: Sun Oct 14, 2018 11:55 am
more specifically 2.99792 x 108. I think in the book they use this (more sig figs) than 3.0 x 108

### Re: Speed of Light

Posted: Sun Oct 14, 2018 11:57 am
I did some research behind it, and some sources are claiming that recent studies show light doesn't always travel at the speed proposed by Einstein's theory. However, for the purposes of this class the speed of light is assumed to be constant.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 12:03 pm
You should treat it as a constant in any sort of calculations done for this class. I’m sure for higher level chemistry this would be different, but at this point I wouldn’t worry.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 2:22 pm
AustinGrove3B wrote:more specifically 2.99792 x 108. I think in the book they use this (more sig figs) than 3.0 x 108

Would it be advisable to calculate using 2.99792 x 10^8 on the exams? I'm not sure when to apply significant figures - either throughout the problem or just for the final answer.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 3:04 pm
sig figs will give more of an precise answer, either way should work :)

### Re: Speed of Light

Posted: Sun Oct 14, 2018 3:42 pm
For the purposes of this class the speed of light probably will always stay the same. Though I think in certain mediums like water or glass the light of speed can change.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 3:58 pm
the speed of light changes with the medium, in air it is 3.0x10^8m/s.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 4:28 pm
Just wanted to add that the speed of light is constant throughout the entire electromagnetic spectrum (~3.00 * 10^8 m/s)

### Re: Speed of Light

Posted: Sun Oct 14, 2018 4:58 pm
It's assumed to be a constant and from my knowledge I believe we will be given the constant.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 5:01 pm
Will we be provided all of these constants/equations during the tests, midterms and final?

### Re: Speed of Light

Posted: Sun Oct 14, 2018 5:55 pm
Anjali 4A wrote:Will we be provided all of these constants/equations during the tests, midterms and final?

I am sure that we will get a cover sheet with all of the constants/equations as we did on the first test on all future tests as well.

### Re: Speed of Light

Posted: Sun Oct 14, 2018 9:06 pm
The speed of light is a constant, therefore it will never change. You can, however, convert it to other units if you wish, as long as all the correct units cancel out.

### Re: Speed of Light

Posted: Mon Oct 15, 2018 9:07 am
The speed of light is always constant, and we are provided the value during tests and exams so we can just use whatever value they give us

### Re: Speed of Light

Posted: Mon Oct 15, 2018 11:48 am
The speed of light is constant and will not change, there may be a more specific value, however, it is most commonly known as 3x10^8 m/s

### Re: Speed of Light

Posted: Mon Oct 15, 2018 4:02 pm
I'm pretty sure that for this class, we treat the speed of light as a constant all the time.

### Re: Speed of Light

Posted: Sat Dec 08, 2018 11:15 pm
Speed of light is constant

### Re: Speed of Light

Posted: Sat Dec 08, 2018 11:16 pm
light always travels at the same speed regardless of wavelength or amplitude. it is a constant.

### Re: Speed of Light

Posted: Fri Jul 05, 2019 2:38 am
The speed of light is constant, and is represented in class as c = 3.00 x 10^8 m/s

### Re: Speed of Light

Posted: Sun Jul 07, 2019 5:40 pm
The speed of light is constant, it helps maintain the equation c= wavelength x frequency by allowing wavelength and frequency to be inversely related.

### Re: Speed of Light

Posted: Sun Jul 07, 2019 6:34 pm
In the context of this class, it should always be treated as a constant.

### Re: Speed of Light

Posted: Wed Oct 02, 2019 9:43 pm
The speed of light is constant in vacuum, and the speed is 3*10^8 m*s^-1, which would also be generally used in solving general problems. However, the speed would actually be a little bit slower when there is air, whereas we generally ignore this difference between the idea and the fact in our calculations for this course.

### Re: Speed of Light

Posted: Thu Oct 03, 2019 11:21 am
The speed of light is always constant.

### Re: Speed of Light

Posted: Fri Oct 04, 2019 12:58 am
Speed of light is a constant and will be given during tests/exams.
The link of the constants and equations sheet is on his website but I'll link it here!

https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

### Re: Speed of Light

Posted: Fri Oct 04, 2019 8:12 am
It does not change, so it is a constant

### Re: Speed of Light

Posted: Fri Oct 11, 2019 4:04 pm
3.00 x 10^8 is the speed of light inside a vacuum.

### Re: Speed of Light

Posted: Fri Oct 11, 2019 6:08 pm
the speed of light is constant ! because it will never change

### Re: Speed of Light

Posted: Sat Oct 12, 2019 1:31 pm
Unless we are not in a vacuum, the speed of light will stay constant at 3.0 x 10^8 m/s.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 4:31 pm
The speed of light won't because it's a constant but sometimes they might be displayed differently due to sig figs and rounding and whatnot.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 7:33 pm
The speed of light is a constant as it doesn't change.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 7:38 pm
the speed of light changes depending on the medium it is traveling through; however, the constant 3.00x10^8 m/s is used when assuming the light is traveling through a vacuum. therefore, in our case, the speed of light is constant.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 7:41 pm
The speed of light is a constant so you don't have to worry about it changing.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 9:00 pm
The speed of light (3. 10^8 m/s) will always be a constant.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 9:57 pm
No need to worry for the sake of problems, light constant will not change.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 10:05 pm
For the purpose of this class we'll assume the speed of light (c) to be roughly 3.00 x 10^8 m/s. Light travels at different speeds through different mediums, but we'll use the vacuum measurement for our calculations

### Re: Speed of Light

Posted: Sat Oct 12, 2019 11:09 pm
This is also something that I was considering. Using the constant as 2.998*10^8 m/s, the book gives two examples of determining wavelengths on page 5. I was wondering why they didn't give any background information on the constant? But overall the responses were helpful.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 11:13 pm
It is a constant.

### Re: Speed of Light

Posted: Sat Oct 12, 2019 11:59 pm
speed of light is a constant!

### Re: Speed of Light

Posted: Sun Oct 13, 2019 12:01 am
The speed of light is a constant (3*10^8) and is always reflected as so on the constant sheet.

### Re: Speed of Light

Posted: Sun Oct 13, 2019 12:03 am
The speed of light will not change. It is consistently 3.8 *10^8.

### Re: Speed of Light

Posted: Sun Oct 13, 2019 12:18 am
C is a constant but of course although it is widely accepted this constant assumes particular conditions like how light particles has no resting mass. There is also quantum field theory that argues the vacuum isn't always empty and has elementary particles that pop in and out if existence which can cause changes in the speed of light.