JEE Main 2026 Physics question
When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is 3.2 V. If a second light having wavelength twice of first light is used, the stopping potential drops to 0.7 V. The wavelength of first light is m. ( J.s, C, m/s)
Answer: (4)
Solution
; . Subtracting:
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