Q.

A photosensitive metal is not emitting photo-electrons when irradiated. It will do so when threshold is crossed. To cross threshold we need to 6. increase

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a

intensity

b

frequency

c

wavelength

d

none of the above

answer is B.

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Detailed Solution

When the frequency of incident radiation is increased, then the energy of photon increases. When energy of photons becomes greater than work function W=hv0 then photo-electrons are emitted.
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