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The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz. If light of frequency 8.2 x 10¹⁴ Hz incident on this metal, the cut-off voltage for the photoelectric emission is nearly
Options
(a) 2 V
(b) 3 V
(c) 5 V
(d) 1 V
Correct Answer:
2 V
Explanation:
K.E = hv – hvₜₕ = eV₀ ( V₀ = cut off voltage)
V₀ = h/e (8.2 x 10¹⁴ – 3.3 x 10¹⁴)
= 6.6 x 10⁻³⁴ x 4.9 x 10¹⁴ / 1.6 x 10⁻¹⁹ = 2 V
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A stone falls freely under gravity.It covers distances h₁,h₂ and h₃
- An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
- Oil spreads over the surface of water where as water does not spread
- The moment of inertia of a thin circular disc about an axis passing through its centre
- Vessel A is filled with hydrogen while vessel B, whose volume is
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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