Question

0
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29. A photon of energy 'E' ejects a photoelectro
from a metal surface whose work functions is W.
this electron enters into a uniform magnetic field
induction 'B' in a direction perpendicular to the fie
and describes a circular path of radius -r', then the
radius 'r' is given by , (in the usual notation)
2em (E-W.
2) V2m(E-W. )eB
B
1)
2e(E-W)
2m (E-W.
3)
4)
mB
eB
30 The​

Answer 1

Explanation:

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