The electromagnetic radiations are in descending order of wavelength in the following sequences :

(1) infra-red waves, radio waves, X-rays, visible light rays

(2) Radio-waves, infra-red waves, visible light rays, X-rays

(3) Radio waves, visible light rays, infra-red waves, X-rays

(4) X-rays, visible light rays, infra-red wave, radio-waves

Subtopic:  Electromagnetic Spectrum |
 81%
From NCERT
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X-rays and γ-rays are both electromagnetic waves, which one of the following statements is true?

(1) in general, X-rays have a larger wavelength than that of γ-rays

(2) X-rays have a smaller wavelength than that of γ-rays

(3) γ-rays have smaller frequency than that of X-rays

(4) wavelength and frequency of X-rays are both larger than those of γ-rays.

Subtopic:  Properties of EM Waves |
 85%
From NCERT
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Which of the following are not electromagnetic waves?

(1) cosmic rays

(2) gamma rays

(3) microwaves

(4) X-rays

Subtopic:  Electromagnetic Spectrum |
 52%
From NCERT
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The frequencies of X-rays, γ-rays and ultraviolet rays are respectively a, b and c. Then :

(1) a < b, b < c

(2) a > b, b > c

(3) a > b, b > a

(4) a < b, b > c

Subtopic:  Properties of EM Waves |
 79%
From NCERT
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A plane electromagnetic wave of frequency 40 MHz travels in free space in the x-direction. At some point and at some instant, the electric field E has its maximum value of 750 N/C in y-direction. The wavelength of the wave is

(1) 3.5 m

(2) 5.5 m

(3) 7.5 m

(4) 9.5 m

Subtopic:  Properties of EM Waves |
 80%
From NCERT
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The waves used in telecommunication are

(1) infrared

(2) visible light

(3) microwaves

(4) ultraviolet rays

Subtopic:  Properties of EM Waves |
 69%
From NCERT
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Select the correct option based on statements:
I:  Light can travel in vacuum but sound cannot do so.
II: Light is an electromagnetic wave and sound is a mechanical wave.

1. Both I and II are true and II is the correct explanation of I.
2. Both I and II are true but II is not the correct explanation of I.
3. I is true but II is false.
4. I is false but II is true.
Subtopic:  Properties of EM Waves |
 82%
From NCERT
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The wave impedance of free space is

(1) 0 Ω

(2) 376.6 Ω

(3) 1883 Ω

(4) 3776 Ω

Subtopic:  Electromagnetic Spectrum |
 53%
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The frequency 1057 MHz of radiation arising from two close energy levels in hydrogen belongs to

(1) radio waves

(2) infrared waves

(3) micro waves

(4) γ-rays

Subtopic:  Electromagnetic Spectrum |
From NCERT
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The wave associated with 2.7 K(kelvin) belongs to

(1) radio waves

(2) micro waves

(3) ultraviolet ways

(4) infrared waves

Subtopic:  Electromagnetic Spectrum |
 50%
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