| ⇦ | 
| ⇨ |
A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly
Options
(a) 10 x 10¹⁴ Hz
(b) 5 x 10¹⁴ Hz
(c) 1 x 10¹⁴ Hz
(d) 20 x 10¹⁴ Hz
Correct Answer:
5 x 10¹⁴ Hz
Explanation:
Eₑ = 2.0 eV = 2 x 1.6 x 10⁻¹⁹ J
Eₑ = hv v = Eₑ/h = 2 x 1.6 x 10⁻¹⁹ J / 6.62 x 10⁻³⁴ Js
= 0.4833 x 10¹⁵ s⁻¹ = 4.833 x 10¹⁴ Hz
app. 5 x 10¹⁴ Hz
Related Questions: - An electric current passes through a long straight wire
- The value of workdone for rotating a magnet of magnetic moment M by an angle θ in external
- A particle is under two mutually perpendicular simple harmonic motions
- An engine pumps water through a hose pipe. Water passes through the pipe
- A missile is fired for maximum range with an initial velocity of 20 m/s
Topics: Electronic Devices
(124)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electric current passes through a long straight wire
- The value of workdone for rotating a magnet of magnetic moment M by an angle θ in external
- A particle is under two mutually perpendicular simple harmonic motions
- An engine pumps water through a hose pipe. Water passes through the pipe
- A missile is fired for maximum range with an initial velocity of 20 m/s
Topics: Electronic Devices (124)
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