KCET 2021 | Electromagnetic Waves Question 3 | Physics

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?

Magnetic field amplitude is $$400 \mathrm{nT}$$.

Angular frequency of EM wave is $$\pi \times 10^8 \mathrm{rad} / \mathrm{s}$$.

Propagation constant (angular wave number) is $$2.1 \mathrm{~rad} / \mathrm{m}$$.

Wavelength of EM wave is $$6 \mathrm{~m}$$.

KCET 2021

MCQ (Single Correct Answer)

-0

The source of electromagnetic wave can be a charge

moving with a constant velocity

moving in a circular orbit

at rest

moving parallel to the magnetic field

KCET 2020

MCQ (Single Correct Answer)

-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

$$2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$

$$1 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$

$$5 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$

$$1.2 \times 10^{-5} \mathrm{~kg}-\mathrm{ms}^{-1}$$

KCET 2019

MCQ (Single Correct Answer)

-0

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

15 m

300 m

15 km

3 km

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