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Electromagnetic Waves · Question 39

AIPMT 2007MCQEasy📈 Topic in 25% papers+4−1
1

The electric and magnetic field of an electromagnetic wave are

  1. in opposite phase and perpendicular to each other
  2. in opposite phase and parallel to each other
  3. in phase and perpendicular to each other
  4. in phase and parallel to each other

Answer

(3) in phase and perpendicular to each other

Solution

As per NCERT, in a plane electromagnetic wave travelling along z:

Ex = E0 (kz - t), By = B0 (kz - t)

both fields reach their maxima and zeros together, i.e. they are in phase.

E is along x and B is along y, they are perpendicular to each other (and both are perpendicular to the direction of propagation).

The fields are in phase and perpendicular to each other.

Answer: (3)

AIPMT 2007

Keep practising — Electromagnetic Waves

2

If v, x and m represent the wavelengths of visible light, X-rays and microwaves respectively, then

  1. m > x > v
  2. m > v > x
  3. v > x > m
  4. v > m > x
AIPMT 2005
3

We consider the radiation emitted by the human body. Which one of the following statements is true?

  1. The radiation emitted is in the infra-red region
  2. The radiation emitted only during the day
  3. The radiation is emitted during the summers and absorbed during the winters
  4. The radiation emitted lies in the ultraviolet region and hence is not visible
AIPMT 2003
4

Which of the following rays are not electromagnetic waves?

  1. X-rays
  2. -rays
  3. -rays
  4. heat rays
AIPMT 2003
5

The velocity of electromagnetic wave is parallel to

  1. B E
  2. E B
  3. E
  4. B
AIPMT 2002
6

What is the cause of greenhouse effect?

  1. infra-red rays
  2. ultra violet rays
  3. X-rays
  4. radio waves.
AIPMT 2002
7

Biological importance of ozone layer is

  1. it stops ultraviolet rays
  2. ozone layer reduces greenhouse effect
  3. ozone layer reflects radio waves
  4. ozone layer controls O2/H2 ratio in atmosphere
AIPMT 2001
8

The frequency order for -rays (a), X-rays (b), UV rays (c) is

  1. b > a > c
  2. a > b > c
  3. c > b > a
  4. a > c > b
AIPMT 2000

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