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Two protons are having same kinetic ene...

Two protons are having same kinetic energy. One proton enters a uniform magnetic field at right angles ot it. Second proton enters a uniform electric field in the direction of field. After some time their de Broglie wavelengths are `lambda_1 and lambda_2` then (a) `lambda_1 = lambda_2` (b) `lambda_1 lt lambda_2` (c) `lambda_1 gt lambda_2` (d) some more information is required

A

`lambda_(1) = lambda_(2)`

B

`lambda gt lambda_(2)`

C

`lambda_(2) gt lambda_(1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
We have work is done by only electric field. Thus if `bar(E)||vec(v),|vec(v)|` decreases, & thus momentum of electron decreases & vice-versa, while in magnetic field `|vec(v)|` remains constant.
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Knowledge Check

  • Two electrons are moving with the same speed v. One electron enters a region of uniform electric field while the other enters a region of uniform magnetic field,then after sometime if the de-Broglie wavelenths of the two are lambda_(1) and lambda_(2) then :

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