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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The penetration power of X-ray increases with the increases in its :

(1) velocity

(2) intensity

(3) frequency

(4) wavelength

Subtopic:  Electromagnetic Spectrum |
 68%
From NCERT
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The shortest wavelength of X-rays emitted from an X-ray tube depends upon

(1) nature of the gas in the tube

(2) the voltage applied to the tube

(3) current in the tube

(4) nature of the target of the tube

Subtopic:  Electromagnetic Spectrum |
 60%
From NCERT
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X-rays are not used for radar purposes, because they are not 

(1) reflected by target

(2) partly absorbed by the target

(3) electromagnetic waves

(4) completely absorbed by the target

Subtopic:  Electromagnetic Spectrum |
 53%
From NCERT
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