For photoelectric emission from certain metal the cut-off frequency is v

⇦

⇨

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:

1. In Young’s double silt experiment, 12 fringes are observed to be formed
2. Small drops of the same size are charges to V volt each. If n such drops coalesce
3. An insulated container of gas has two champers seperated by an insulating partition.
4. Two identical capacitors are first connected in series and then in parallel.
5. The binding energy of deutron is 2.2 MeV and that of ₂⁴He is 28 MeV.

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