| ⇦ | 
| ⇨ |
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 potential(in volts) in a region is expressed as V(x,y,z) = 6xy – y + 2yz,
- An air core solenoid has 1000 turns and is one meter long. Its cross sectional area
- A 100Ω resistance and a capacitor of 100Ω reactance are connected in series
- The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second
- In a vaccum triode the function of grid voltage is
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If potential(in volts) in a region is expressed as V(x,y,z) = 6xy – y + 2yz,
- An air core solenoid has 1000 turns and is one meter long. Its cross sectional area
- A 100Ω resistance and a capacitor of 100Ω reactance are connected in series
- The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second
- In a vaccum triode the function of grid voltage is
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