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NEET 2014 Physics question

PhysicsDual Nature of Matter and RadiationNEET 2014

When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is

Answer: (2)

Solution

Einstein's photoelectric equation: . Initially ... (1). After a 20% increase in energy: ... (2). Multiply (1) by 1.2: .

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Question ID VK-091513