Mathematics · Photoelectric Effect
When light of a given wavelength falls on a metallic surface, the stopping potential for photoelectrons is 3.2 V. If a second light having a wavelength twice that of the first light is used, the stopping potential drops to 0.7 V. The wavelength of the first light is ________ m. (h = 6.63 × 10-34 J·s, e = 1.6 × 10-19 C, c = 3 × 108 m/s)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12.5 × 10-7✓
- 23.1 × 10-7
- 32.2 × 10-8
- 42.9 × 10-8
Correct answer
2.5 × 10-7
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