Question

A proton is fired from very far away towards a nucleus with charge Q = 120 e, where e is the electronic charge. It makes a closest approach of 10 fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is :

 (take the proton mass, and

)

A

B

C

D

Hard
Solution
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Correct option is A)

Given here,

( charge on proton)

It is based on conservation of energy of proton.

Also, we know, de’broglie wavelength,

Thus,

 

Option A is correct.

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