# Particles q help plssss

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#1
Why is the mass not required? Ke=0.5 mv^2= hc/lamda?
And why is answer d wrong? I did -21.8+5.4
Last edited by Htx_x346; 1 month ago
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1 month ago
#2
(Original post by Htx_x346)
Why is the mass not required? Ke=0.5 mv^2= hc/lamda?
And why is answer d wrong? I did -21.8+5.4
For the second question, you've worked out the amount of energy required for the energy level jump. The question asks for the energy of the free electron after the collision.

The first question I'm not entirely sure, I think it's because the energy of the accelerated electron can be given as eV( where is e is the charge of an electron and V is the potential difference). So eV=hc/lamda and from here the only variable missing is mass. Someone correct me if my answer to part 1 is wrong, as I said I'm not sure.
Last edited by Skiwi; 1 month ago
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#3
(Original post by Skiwi)
For the second question, you've worked out the amount of energy required for the energy level jump. The question asks for the energy of the free electron after the collision.

The first question I'm not entirely sure, I think it's because the energy of the accelerated electron can be given as eV( where is e is the charge of an electron and V is the potential difference). So eV=hc/lamda and from here the only variable missing is mass. Someone correct me if my answer to part 1 is wrong, as I said I'm not sure.
Thank you x
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1 month ago
#4
That is correct.eV = hc / lambda
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X

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