| ⇦ | 
| ⇨ |
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: - The young’s modulus of steel is twice that of brass. Two wires of same length
- The order of the electric field near the earth’s surface is
- An unpolarised beam of intensity I is incident on a pair of nicols making an angle
- A metal plate weighing 750g is to be electroplated with 0.05% of its weight of silver.
- A U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second.
Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The young’s modulus of steel is twice that of brass. Two wires of same length
- The order of the electric field near the earth’s surface is
- An unpolarised beam of intensity I is incident on a pair of nicols making an angle
- A metal plate weighing 750g is to be electroplated with 0.05% of its weight of silver.
- A U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second.
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