| ⇦ | 
| ⇨ |
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: - Two spheres A and B of masses m and m respectively collide. A is at rest initially
- A particle moving in a straight line covers half the distance with speed of 3 m/s
- A wire of a certain material is stretched slowly by ten percent. Its new resistance
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A body revolved around the sun 27 times faster than the earth. What is the ratio
Topics: Electronic Devices
(124)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two spheres A and B of masses m and m respectively collide. A is at rest initially
- A particle moving in a straight line covers half the distance with speed of 3 m/s
- A wire of a certain material is stretched slowly by ten percent. Its new resistance
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A body revolved around the sun 27 times faster than the earth. What is the ratio
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