1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Suppose that the electric field amplitude of electromagnetic wave is $$E_0=120 \mathrm{~NC}^{-1}$$ and its frequency $$f=50 \mathrm{~MHz}$$. Then, which of the following value is incorrectly computed?

A
Magnetic field amplitude is $$400 \mathrm{nT}$$.
B
Angular frequency of EM wave is $$\pi \times 10^8 \mathrm{rad} / \mathrm{s}$$.
C
Propagation constant (angular wave number) is $$2.1 \mathrm{~rad} / \mathrm{m}$$.
D
Wavelength of EM wave is $$6 \mathrm{~m}$$.
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

The source of electromagnetic wave can be a charge

A
moving with a constant velocity
B
moving in a circular orbit
C
at rest
D
moving parallel to the magnetic field
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A light beam of intensity $$20 \mathrm{~W} / \mathrm{cm}^2$$ is incident normally on a perfectly reflecting surface of sides $$25 \mathrm{~cm} \times 15 \mathrm{~cm}$$. The momentum imparted to the surface by the light per second is

A
$$2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
B
$$1 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
C
$$5 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
D
$$1.2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

An antenna uses electromagnetic waves of frequency $$5 \mathrm{~MHz}$$. For proper working, the size of the antenna should be

A
15 m
B
300 m
C
15 km
D
3 km
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