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NEET 2016 Physics question

PhysicsDual Nature of Matter and RadiationNEET 2016

When a metallic surface is illuminated with radiation of wavelength , the stopping potential is . If the same surface is illuminated with radiation of wavelength , the stopping potential is . The threshold wavelength for the metallic surface is:

Answer: (4)

Solution

Einstein's photoelectric equation: , where is the work function. Case 1: ... (i). Case 2: ... (ii). From (ii), $eV

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Question ID VK-091863