How to know which equation to use


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904914037
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Joined: Wed Sep 18, 2019 12:16 am

How to know which equation to use

Postby 904914037 » Tue Oct 08, 2019 9:36 am

When trying to find the velocity of an object, how do you know whether to use the equation v=c/(wavelength) or v=h/(mass x wavelength)?

505312292
Posts: 63
Joined: Sat Aug 17, 2019 12:17 am

Re: How to know which equation to use

Postby 505312292 » Tue Oct 08, 2019 10:27 am

We can only use v=c/wavelength if you're trying to find the frequency of light

505312292
Posts: 63
Joined: Sat Aug 17, 2019 12:17 am

Re: How to know which equation to use

Postby 505312292 » Tue Oct 08, 2019 10:33 am

And isn't it also whatever value is given? Is there an example problem that you have?

Brittany Tran 3I
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Joined: Sat Jul 20, 2019 12:16 am

Re: How to know which equation to use

Postby Brittany Tran 3I » Tue Oct 08, 2019 5:58 pm

the equation v=c/wavelength is used to find frequency, not velocity. you can use v=h/(mass*wavelength) to find velocity, depending on the specific question

Minh Ngo 4B
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Joined: Thu Jul 25, 2019 12:17 am

Re: How to know which equation to use

Postby Minh Ngo 4B » Tue Oct 08, 2019 6:39 pm

I think you get confused "v" of velocity and "v" of frequency. But i guess it depends on the info given to you???

904914037
Posts: 65
Joined: Wed Sep 18, 2019 12:16 am

Re: How to know which equation to use

Postby 904914037 » Tue Oct 08, 2019 9:24 pm

Yes, I forgot that "V" and "v" represent different variables! Thank you for the clarification, it makes sense now!

BeylemZ-4A
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Joined: Thu Jul 25, 2019 12:17 am

Re: How to know which equation to use

Postby BeylemZ-4A » Wed Oct 09, 2019 3:20 pm

904914037 wrote:When trying to find the velocity of an object, how do you know whether to use the equation v=c/(wavelength) or v=h/(mass x wavelength)?

the "v" is not in reference to velocity as it would be in Physics. the "v" is the frequency of the light!! definitely a distinction that needs to be made.

505106414
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Joined: Wed Sep 18, 2019 12:17 am

Re: How to know which equation to use

Postby 505106414 » Thu Oct 10, 2019 11:43 pm

What is a real-world application of this equation?

Jocelyn Thorp 3K
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Joined: Wed Sep 18, 2019 12:20 am

Re: How to know which equation to use

Postby Jocelyn Thorp 3K » Fri Oct 11, 2019 12:10 am

505106414 wrote:What is a real-world application of this equation?


the v for frequency is actually nu (fun fact), and this is used to calculate wavelength, where c=lambda*v.

Brynne Burrows 3K
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

Re: How to know which equation to use

Postby Brynne Burrows 3K » Fri Oct 11, 2019 1:18 am

Both of those equations are referring to v as frequency instead of velocity, but you can use velocity in the equation E=1/2Me*Ve.


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