Test 2 Q2c

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Erica Li 1C
Posts: 31
Joined: Fri Sep 28, 2018 12:17 am

Test 2 Q2c

Postby Erica Li 1C » Sat Dec 08, 2018 11:52 am

How do you calculate the wavelength of the ejected electron?
It's given that the chromium metal is irradiated with light (wavelength 3.45x10^-11 m) and the kinetic energy is 2x10^-19 J and in part a it was found that the work function is 5.76 x 10^-15 J, but how do you find the wavelength of the ejected electron?

Alexandra Albers 1D
Posts: 61
Joined: Fri Sep 28, 2018 12:18 am

Re: Test 2 Q2c

Postby Alexandra Albers 1D » Sat Dec 08, 2018 12:38 pm

First, use the equation Kinetic Energy=1/2*m*v^2 to figure out what v is. Then you need to use De Broglie's equation, so your wavelength is equal to Planck's constant over momentum (mass*velocity). If you plug in h, m, and v, you should be able to calculate your wavelength value.

Lucy Agnew 3E
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

Re: Test 2 Q2c

Postby Lucy Agnew 3E » Sat Dec 08, 2018 1:08 pm

Is someone able to share a picture or pdf of this question in test 2?


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