Dual Nature of matter and Radiation Part 2

Section: Physics

Question : 3 of 100

Marks: +1, -0

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.
(h=6.63×10−34J.s,e=1.6×10−19C,c=3×108m∕s)

[24 Jan 2026 Shift 2]

2.9×10−8
2.5×10−7
3.1×10−7
2.2×10−8

Validate

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