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The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be
Options
(a) 4×10¹⁰ Hz
(b) 4×10¹⁴ Hz
(c) 4×10¹¹ Hz
(d) 4×10¹⁵ Hz
Correct Answer:
4×10¹⁴ Hz
Explanation:
Maximum wavelength (in Å) = 12375 / ɸ (in eV)
⇒ λ₀ = 12375 / 1.65 = 7,500 Å = 7.5 × 10⁻⁷ m
Hence minimum frequency = ʋ₀ = c / λ₀
⇒ ʋ₀ = (3 × 10⁸) / (7.5 × 10⁻⁷) = 4 × 10¹⁴ Hz
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The intermediate image formed by the objective of a compound microscope is
- Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept
- An aicraft executes a horizontal loop of radius 1 km with a speed of 900 kmh⁻¹
- A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
- The current in a conductor varies with time t as I=2t+3t² Where I is in amperes
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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