A photon-sensitive metal is not emitting phot | vedclass

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(B) According to the photoelectric effect,the emission of photoelectrons occurs only when the incident radiation has a frequency greater than or equal

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(B) According to the photoelectric effect,the emission of photoelectrons occurs only when the incident radiation has a frequency greater than or equal to the threshold frequency $(
u_0)$.If the metal is not emitting photoelectrons,it means the frequency of the incident radiation is less than the threshold frequency.Since the energy of a photon is given by $E = h
u$,increasing the frequency $(
u)$ increases the energy of the photons.Increasing the intensity only increases the number of photons,not their individual energy,so it cannot cause emission if the threshold frequency is not met.Therefore,we must increase the frequency of the incident radiation to cross the threshold.

$A$ photon-sensitive metal is not emitting photoelectrons when irradiated. It will do so when the threshold is crossed. To cross the threshold,we need to increase:

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