The energy of the EM waves is of the order of 15 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 |
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Light with an energy flux of 25 × 104 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 |
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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. Infra-red waves produce heating in a microwave oven.
4. The frequency of the microwaves must match the
resonant frequency of the water molecules.

Subtopic:  Properties of EM Waves |
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The electric field associated with an electromagnetic wave in a vacuum is given by;  $$\vec{E}=40cos\left ( kz-6\times 10^{8}t \right )\hat{i},$$ where E, z and t are in volt/m, meter and second respectively. The value of wave vector k is:

1. 2 m-1

2. 0.5 m-1

3. 6 m-1

4. 3 m-1

Subtopic:  Properties of EM Waves |
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The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to:

 1 reciprocal of speed of light in vacuum 2 the ratio of magnetic permeability to the electric susceptiblity of vaccum 3 unity 4 the speed of light in vacuum
Subtopic:  Properties of EM Waves |
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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 |
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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 |
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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 |
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The electric field of an electromagnetic wave in a free space is given by –
, where t and x are in seconds and metres respectively. It can be inferred that -

(a) The wavelength λ is 188.4 m
(b) The wave number k is 0.33 rad / m
(c) The wave amplitude is 10 V / m
(d) The wave is propagating along + x direction

Which one of the following pairs of statements is correct?

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (c)

Subtopic:  Properties of EM Waves |
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The electric field part of an electromagnetic wave in a medium is represented by
Ex =0;
Ey=$2.5\frac{\mathrm{N}}{\mathrm{C}}\mathrm{cos}\left[\left(2\mathrm{\pi }×{10}^{6}\frac{\mathrm{rad}}{\mathrm{m}}\right)t-\left(\mathrm{\pi }×{10}^{-2}\frac{\mathrm{rad}}{\mathrm{s}}\right)x\right]$

Es = 0. The wave is
1. Moving along y-direction with frequency 21$\mathrm{\pi }$ 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 |
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