When a certain metal was irradiated with a light of frequency 3.2 × 1016 Hz, the photoelectrons emitted had twice the K.E as did photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 × 106 Hz. Hence threshold frequency is

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When a certain metal was irradiated with a light of frequency 3.2 × 1016 Hz, the photoelectrons emitted had twice the K.E as did photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 × 106 Hz. Hence threshold frequency is