The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.

The Threshold Frequency For A Photosensitive Metal Is 33 X Physics Question

The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz. If light of frequency 8.2 x 10¹⁴ Hz incident on this metal, the cut-off voltage for the photoelectric emission is nearly

Options

(a) 2 V
(b) 3 V
(c) 5 V
(d) 1 V

Correct Answer:

2 V

Explanation:

K.E = hv – hvₜₕ = eV₀ ( V₀ = cut off voltage)
V₀ = h/e (8.2 x 10¹⁴ – 3.3 x 10¹⁴)
= 6.6 x 10⁻³⁴ x 4.9 x 10¹⁴ / 1.6 x 10⁻¹⁹ = 2 V

Related Questions:

  1. The drive shaft of an automobile rotates at 3600 rpm and transmits 80 HP
  2. A nuclear reaction is given as 4 ₁H¹→₂He⁴+₀e¹+energy Mention the type of reaction.
  3. A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series
  4. A body of mass 3 kg acted upon by a constant force is displaced by S meter
  5. If the length of a closed organ pipe is 1.5 m and velocity of sound is 330 m/s,

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*