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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The electric field part of an electromagnetic wave in a medium is represented by 
Ex =0; 
Ey=2.5NCcos2π×106radmt-π×10-2radsx
 
Es = 0. The wave is:
1. Moving along y-direction with frequency 21 π x 106 Hz and wavelength 200 m.
2. Moving along x-direction with frequency 106 Hz and wavelength 100m
3. Moving along x-direction with frequency 106 Hz and wavelength 200m
4. Moving along x-direction with frequency 106 Hz and wavelength 800m
Subtopic:  Properties of EM Waves |
 78%
From NCERT
AIPMT - 2009
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The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by:

1.  εoμo

2.  μoεo

3.  1μoεo

4.  μoεo

Subtopic:  Properties of EM Waves |
 92%
From NCERT
AIPMT - 2008
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The electric and magnetic fields of an electromagnetic wave are:

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

Subtopic:  Properties of EM Waves |
 84%
From NCERT
AIPMT - 2007
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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 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 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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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 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 |
 58%
From NCERT
NEET - 2015
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