## c = fλ

$c=\lambda v$

105194078
Posts: 52
Joined: Thu Sep 19, 2019 12:17 am

### c = fλ

During the lecture, Dr. Lavelle posted on the slide show that c = fλ = 3.00 x 10^8 m.s. ^-1
Is this always true?

JinwooLee_1F
Posts: 47
Joined: Sat Aug 17, 2019 12:15 am

### Re: c = fλ

Yea I think the c stays constant, but the f and λ can change.

Tiffany_Chen 2K
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

### Re: c = fλ

Yes, c will be the speed of light which is the constant. λ represents wavelength, and F stands for frequency, which is the number of waves it takes to cross a point in 1 sec.

Kehlin Hayes 4C
Posts: 50
Joined: Wed Sep 18, 2019 12:17 am

### Re: c = fλ

You can use the inverse relationship between frequency and wavelength in order to find the constant speed of light.

Posts: 51
Joined: Fri Aug 30, 2019 12:17 am

### Re: c = fλ

the speed of light is always constant. light moves at the same speed no matter what

Savannah Mance 4G
Posts: 107
Joined: Fri Aug 30, 2019 12:17 am

### Re: c = fλ

So, even if the f or λ changes, it is still always equal to 3.00 x 10^8 m.s. ^-1/?

Serena Siddiq 3D
Posts: 51
Joined: Fri Aug 30, 2019 12:17 am

### Re: c = fλ

Savannah Mance 3B wrote:So, even if the f or λ changes, it is still always equal to 3.00 x 10^8 m.s. ^-1/?

Yes, I know it sounds wrong since one side of the equation is changing, the other side should as well. But, the speed of light is constant, so it would not be affected by the changes in frequency and wavelength.

EthanPham_1G
Posts: 104
Joined: Sat Jul 20, 2019 12:17 am

### Re: c = fλ

I think that c=3.00 x 10^8 is always true in the case of the speed of light. The equation c=λv is used to find the speed of any type of wave. The speed of other types of waves will probably not equal 3.00 x 10^8 because that is the speed of light waves.

nickianel_4b
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

### Re: c = fλ

Does anyone know if this equation is used for other types of waves? I'm trying to do 1A #7 for the homework, and it gives the frequency and I have to find the wavelength, but the wave is an x ray.

Mallika Chimpiri 3K
Posts: 58
Joined: Thu Jul 25, 2019 12:17 am

### Re: c = fλ

Yes, the c is a constant and will always equal 3.00 X 10^8. The frequency and wavelength vary inversely so their product will always equal the constant c.