The energy of the EM waves is of the order of \(15~\mathrm{keV}\). To which part of the spectrum does it belong?
1. X-rays
2. Infrared rays
3. Ultraviolet rays
4. \(\gamma\)-rays

Subtopic:  Electromagnetic Spectrum |
 57%
From NCERT
NEET - 2015
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Light with an energy flux of \(25\times10^4\) Wm–2 falls on a perfectly reflecting surface at normal incidence. If the surface area is \(15\) cm2, the average force exerted on the surface is:
1. \(1.25\times 10^{-6}\) N
2. \(2.50\times 10^{-6}\) N
3. \(1.20\times 10^{-6}\) N
4. \(3.0\times 10^{-6}\) N

Subtopic:  Properties of EM Waves |
 63%
From NCERT
AIPMT - 2014
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The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:

1. the frequency of microwaves has no relation with the natural frequency of water molecules.
2. microwaves are heatwaves, so always produce heating.
3. infrared waves produce heating in a microwave oven.
4. the frequency of the microwaves must match the resonant frequency of the water molecules.
Subtopic:  Electromagnetic Spectrum |
 78%
From NCERT
AIPMT - 2013
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\(\alpha\)- particles, \(\beta\)-particles and \(\gamma\)-rays are all having the same energy. Their penetrating power in a given medium in increasing order will be:
1. \(\gamma , \alpha, \beta \)
2. \( \alpha, \beta , \gamma \)
3. \( \beta, \alpha , \gamma \)
4. \(\beta, \gamma, \alpha \)
Subtopic:  Properties of EM Waves |
 72%
From NCERT
NEET - 2013
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An electromagnetic wave of frequency \(\nu=3.0\) MHz passes from vacuum into a dielectric medium with relative permittivity \(\epsilon =4.0\) Then:
 
1. wavelength is doubled and frequency becomes half.
2. wavelength is halved and frequency remains unchanged.
3. wavelength and frequency both remain unchanged.
4. wavelength is doubled and frequency unchanged.
Subtopic:  Properties of EM Waves |
 71%
From NCERT
NEET - 2013
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The electric field associated with an electromagnetic wave in a vacuum is given by;  \(\vec{E}=40\cos\left ( kz-6\times 10^{8}t \right )\hat{i}, \) where \(E,z\) and \(t \) are in volt/m, meter, and second respectively. The value of the wave vector \(k\) is: 
1. \(2~\mathrm{m}^{-1}\)
2. \(0.5~\mathrm{m}^{-1}\)
3. \(6~\mathrm{m}^{-1}\)
4. \(3~\mathrm{m}^{-1}\)
Subtopic:  Properties of EM Waves |
 76%
From NCERT
AIPMT - 2012
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The ratio of the amplitude of a magnetic field to the amplitude of an electric field for an electromagnetic wave propagating in a vacuum is equal to:

1. reciprocal of speed of light in vacuum.
2. the ratio of magnetic permeability to the electric susceptibility of vacuum.
3. unity.
4. the speed of light in a vacuum.
Subtopic:  Properties of EM Waves |
 76%
From NCERT
AIPMT - 2012
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The electric and the magnetic fields, associated with an electromagnetic wave, propagating along the positive Z-axis, can be represented by:
1. \(\left [E=E_{0}\hat{k},~B=B_{0}\hat{i} \right ]\)
2. \(\left [E=E_{0}\hat{j},~B=B_{0}\hat{j} \right ]\)
3. \(\left [E=E_{0}\hat{j},~B=B_{0}\hat{k} \right ]\)
4. \(\left [E=E_{0}\hat{i},~B=B_{0}\hat{j} \right ]\)

Subtopic:  Properties of EM Waves |
 89%
From NCERT
AIPMT - 2011
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The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is:
1. gamma rays, ultraviolet, infrared, microwaves.
2. microwaves, gamma rays, infrared, ultraviolet.
3. infrared, microwave, ultraviolet, gamma rays.
4. microwave, infrared, ultraviolet, gamma rays.
Subtopic:  Electromagnetic Spectrum |
 84%
From NCERT
AIPMT - 2011
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Which of the following statement is false for the properties of electromagnetic waves?

1. Both electric and magnetic field vectors attain the maxima and
minima at the same place and same time.
2. The energy in the electromagnetic wave is divided equally
between electric and magnetic vectors.
3. Both electric and magnetic field vectors are parallel to each
other and perpendicular to the direction of propagation of the wave.
4. These waves do not require any material medium for propagation.

Subtopic:  Properties of EM Waves |
 83%
From NCERT
AIPMT - 2010
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