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option 2.
photoelectric effect is observed only when the actual frequency(v) is greater than the minimum frequency(v not)
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option second .when the velocity is not greater than threshold velocity
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option 2, because photoelectric effect is observed only when
the frequency of the emitted radiations (v) is greater than the threshold frequency(v₀).
the frequency of the emitted radiations (v) is greater than the threshold frequency(v₀).
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