## Calculating velocity

$\lambda=\frac{h}{p}$

Maria Roman 1A
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Joined: Fri Apr 06, 2018 11:04 am

### Calculating velocity

When given wavelength, how would velocity be calculated?

Chem_Mod
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### Re: Calculating velocity

You need to give me more information for me to answer this. Based on your question, it seems to be a de Broglie wavelength problem.

Steven Luong 1E
Posts: 33
Joined: Fri Apr 06, 2018 11:03 am

### Re: Calculating velocity

Given the wavelength, this might be a De Broglie problem. Since Lambda-max = h/(mass x velocity), you should convert Lambda into meters and you are probably given a mass. The Planck's constant is h. Then just plug all the values in and solve for velocity.

Andre-1H
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Joined: Fri Apr 06, 2018 11:01 am

### Re: Calculating velocity

I'm pretty sure that the only way to calculate it would be if the mass of the object with that wavelength is given because otherwise with the DeBroglie equation there would be two unknown variables.

Posts: 40
Joined: Fri Apr 06, 2018 11:02 am

### Re: Calculating velocity

typically you would use the debroglie equation. You would have wavelength = h over m times v. you would switch v and wavelength and solve for v.

Amir Akhavan 1E
Posts: 34
Joined: Fri Apr 06, 2018 11:01 am

### Re: Calculating velocity

To find velocity you can just use the equation that wavelength equals planks constant over mass times velocity. You should know the mass of the object such as an electron which will be given.