Question

Photoelectric emission is observed from a surface
for frequencies n, and n1 of incident radiations
(n1>n2). If the maximum kinetic energy of
photoelectrons in the two cases are in the ratio of
1:2. then threshold frequency n1 is given by
a) v2-v1/2-1
b)2v1-v2/2-1
c) 2v2-v1/2-1
d) v2-v1/2
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Answer 1

can be done from the relationship of kinetic energy and total energy