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 moment of inertia of a rod about an axis through its centre and perpendicular
  2. In the middle of the depletion layer of a reverse-biased P-N junction, the
  3. Which of the following is true for number of spectral lines in going from Lyman series
  4. In photoelectric emission process from a metal of work function
  5. The surface tension of soap solution is 0.03 N/m. The work done in blowing to form a soap

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Your email address will not be published.


*