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JEE Main 2022 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2022

When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is . When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes . If , the value of x will be .

Answer: 2

Solution

Let the work function be . Then and $5φ =

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Question ID VK-024095