| ⇦ | 
| ⇨ |
The electric field associated with an e.m. wave in vacuum is given by E = i 40 cos (kz – 6 x 10⁸ t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is:
Options
(a) 2 m⁻¹
(b) 0.5 m⁻¹
(c) 6 m⁻¹
(d) 3 m⁻¹
Correct Answer:
2 m⁻¹
Explanation:
On comparing the given equation to
E = a₀i cos (ωt – kz) ω = 6 x 10⁸ ,
k = 2π / r = ω / c
k = ω / c = 6 x 10⁸ / 3 x 10⁸ = 2 m⁻¹
Related Questions: - A hollow sphere of radius 0.1m has a charge of 5×10⁻⁸C. The potential
- Which of the following transitions will have highest emission wavelength?
- A source of sound and a detector are moving along the same line with same speed
- A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
- In Young’s double slit experiment, when wavelength used is 6000Å and the screen
Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A hollow sphere of radius 0.1m has a charge of 5×10⁻⁸C. The potential
- Which of the following transitions will have highest emission wavelength?
- A source of sound and a detector are moving along the same line with same speed
- A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
- In Young’s double slit experiment, when wavelength used is 6000Å and the screen
Topics: Electromagnetic Waves (28)
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