| ⇦ | 
| ⇨ |
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: - If a small sphere is let fall vertically in a large quantity of still liquid of density
- A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
- If the velocity of sound in air is 350 m/s, thent he fundamental frequency
- In a vaccum triode the function of grid voltage is
- A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If a small sphere is let fall vertically in a large quantity of still liquid of density
- A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
- If the velocity of sound in air is 350 m/s, thent he fundamental frequency
- In a vaccum triode the function of grid voltage is
- A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply