When a certain metal was irradiated with a light of frequency 3.2 * 10 to d power 16 Hz, the photo electrons had twice the K.E as emitted when d same metal was irradiated with light of frequency 2*10 to d power 16 Hz. Calculate the threshold frequency of the metal.
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The threshold frequency of the metal is :
0.8 × 10 ^16Hz or 8 × 10^15 Hz.
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