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  3. The maximum KE of the photoelectron is found to be 6.63\times10^{-19}J, when the metal is irradiated with a radiation of frequency 2\times10
# Engineering

The maximum KE of the photoelectron is found to be 6.63 x10-19 J, when the metal is irradiated with radiation of frequency 2 x 1015 Hz. The threshold frequency of the metal is:

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