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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: - In the Young’s double slit experiment, a point P on the central bright fringe
- A body is thrown upward from ground covers equal distances
- The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
- At what angle should the two forces 2P and √2 P act,so that the resultant force is P√10?
- A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the Young’s double slit experiment, a point P on the central bright fringe
- A body is thrown upward from ground covers equal distances
- The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
- At what angle should the two forces 2P and √2 P act,so that the resultant force is P√10?
- A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool
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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