MHT CET 2024 Physics question
When a certain metallic surface is illuminated with monochromatic light wavelength , the stopping potential for photoelectric current is . When the same surface is illuminated with light of wavelength the stopping potential is . the threshold wavelength for this surface for photoelectric effect is
Answer: (A)
Solution
Einstein's equation: . For the two cases: and . Subtracting: , so . Then . The threshold wavelength
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