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 |
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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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The energy of the X-rays photon is 3.3×10-16J. Its frequency is :

(1) 2×1019 Hz

(2) 5×1018 Hz

(3) 5×1017 Hz

(4) 5×1016 Hz

Subtopic:  Maxwell's Equations |
 75%
From NCERT
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If a source is transmitting an electromagnetic wave of frequency 8.2×106 Hz, then the wavelength of the electromagnetic wave transmitted from the source will be:

1. 36.6 m 2. 40.5 m
3. 42.3 m 4. 50.9 m
Subtopic:  Generation of EM Waves |
 88%
From NCERT
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A plane electromagnetic wave Ez=100 cos(6×108t+4x) V/m propagates in a medium of dielectric constant

(1) 1.5

(2) 2.0

(3) 2.4

(4) 4.0

Subtopic:  Properties of EM Waves |
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If μ0 be the permeability and K0 the dielectric constant of a medium, its refractive index is given by

(1) 1μ0K0

(2) 1μ0K0

(3) K0

(4) μ0K0

Subtopic:  Properties of EM Waves |
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If ε0 and μ0 represent the permittivity and permeability of vacuum and ε and  μ represent the permittivity and permeability of the medium, the refractive index of the medium is given by:

1. ε0μ0εμ

2. εμε0μ0

3. εμ0ε0

4. μ0ε0ε

Subtopic:  Properties of EM Waves |
 72%
From NCERT
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The magnetic field between the plates of radius 12 cm separated by a distance of 4 mm of a parallel plate capacitor of capacitance 100 pF along the axis of plates having conduction current of 0.15 A is

(1) zero

(2) 1.5 T

(3) 15 T

(4) 0.15 T

Subtopic:  Maxwell's Equations |
 59%
From NCERT
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