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JEE Main 2022 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2022

The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 6630 Å is 0.42 V. If the threshold frequency is , where x is (nearest integer). (Given, speed of light = m/s, Planck's constant = Js)

Answer: 35

Solution

− = : = . The photon energy is $3

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Question ID VK-025223