1.34

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Melissa_Aguirre1J
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Joined: Tue Nov 14, 2017 3:02 am

1.34

Postby Melissa_Aguirre1J » Sat May 05, 2018 11:59 pm

1.34 The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.5  103 kms1?

Susu Le 1F
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Joined: Thu Feb 01, 2018 3:01 am
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Re: 1.34

Postby Susu Le 1F » Sun May 06, 2018 3:33 am

Energy of the photon of radiation=work function+kinetic energy of the electron
1) Convert 4.37 eV to J using 1 eV=1.602x10-19 J. This is the work function.
2) Find the kinetic energy of the electron by using Ek=1/2*m*v^2.
3) Add the work function and the Ek(kinetic energy) together to get the energy of the photon.
4) Use E=hc/lambda to find lambda (the wavelength of the light).

105012653 1F
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

Re: 1.34

Postby 105012653 1F » Thu Jun 14, 2018 1:01 pm

I did the steps but I still got something different...


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