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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.
A
3.1 × 10⁻⁷
B
2.9 × 10⁻⁸
C
2.2 × 10⁻⁸
D
2.5 × 10⁻⁷
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