Relationship Between Velocity and Wavelength

$c=\lambda v$

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DMuth_1J
Posts: 63
Joined: Thu Jul 11, 2019 12:15 am

Relationship Between Velocity and Wavelength

Hello, I was working on the photoelectric effect module and was stumped by the problem that gives the velocity and the work, and asked us to calculate the energy. I'm not sure how to use the velocity or how it fits into our equations, but thought it might have something to do with wavelength. Can somebody help?

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Relationship Between Velocity and Wavelength

I'm not entirely sure this is correct, but the only instance I've seen velocity and wavelength related is with the work-function equation. This is used to find the energy required to remove an electron from a metal:
E=1/2 m v^2=hv-Φ
1B in the textbook talks about this. Hope it helps.

JOtomo1F
Posts: 66
Joined: Sat Aug 24, 2019 12:16 am
Been upvoted: 1 time

Re: Relationship Between Velocity and Wavelength

I also need help with this problem.

Clara Cho 2K
Posts: 103
Joined: Wed Sep 18, 2019 12:18 am

Re: Relationship Between Velocity and Wavelength

What are the units for velocity?

asannajust_1J
Posts: 105
Joined: Wed Sep 11, 2019 12:16 am
Been upvoted: 1 time

Re: Relationship Between Velocity and Wavelength

Clara Cho wrote:What are the units for velocity?

velocity units are m/s

Eesha Sohail 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

Re: Relationship Between Velocity and Wavelength

In terms of the original question you asked - the relationship between velocity and wavelength for light is given by this equation:
$V = f\lambda$
Where V is the velocity of the wave in meters per second, $\lambda$ (lambda) is the wavelength in meters, and f is the frequency, or cycles per second.

I believe for the question you are asking, @EvanWang gave the right equation, but I thought you might appreciate the added context. Hope this helps!

nicole-2B
Posts: 103
Joined: Fri Aug 30, 2019 12:18 am

Re: Relationship Between Velocity and Wavelength

Eesha Sohail 1J wrote:In terms of the original question you asked - the relationship between velocity and wavelength for light is given by this equation:
$V = f\lambda$
Where V is the velocity of the wave in meters per second, $\lambda$ (lambda) is the wavelength in meters, and f is the frequency, or cycles per second.

I believe for the question you are asking, @EvanWang gave the right equation, but I thought you might appreciate the added context. Hope this helps!

Thank you for explaining!

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