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For photoelectric emission from certain metal the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)
Options
(a) √ hv / m
(b) √ 2hv / m
(c) 2 √hv / m
(d) √ hv / (2m)
Correct Answer:
√ 2hv / m
Explanation:
From photo-electric equation,
hv’ = hv + Kₘₐₓ …(i)
h.2v = hv + 1/2 mV²ₘₐₓ [ v’ = 2v ]
hv = 1/2 mV²ₘₐₓ ⇒ Vₘₐₓ = √ 2hv / m
Related Questions: - Coherent sources are those sources for which
- If a solid ball of metal has a concentric spherical cavity with in it if the ball
- CO₂ laser uses
- The magnetic susceptibility is negative for
- An object is projected with a velocity of 20 m/s making an angle of 45⁰ with horizontal.
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Coherent sources are those sources for which
- If a solid ball of metal has a concentric spherical cavity with in it if the ball
- CO₂ laser uses
- The magnetic susceptibility is negative for
- An object is projected with a velocity of 20 m/s making an angle of 45⁰ with horizontal.
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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