COMEDK 2024 Afternoon Shift | Electromagnetic Waves Question 2 | Physics

An electromagnetic wave of frequency $$3 \mathrm{~MHz}$$ passes from vacuum into a dielectric medium $$(\mu_r=1)$$ of relative permittivity 4.0. Then,

Wavelength is halved and frequency is doubled

Wavelength doubled and frequency remains unchanged

Wavelength and frequency are unchanged

Wavelength is halved and frequency remains unchanged

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-0

The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is

reciprocal of speed of light in vacuum

the speed of light in vacuum

proportional to frequency of the electromagnetic wave

inversely proportional to the frequency of the electromagnetic wave

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-0

A plane electromagnetic wave of frequency $$20 \mathrm{~MHz}$$ travels through a space along $$x$$-direction. If the electric field vector at a certain point in space is $$6 \mathrm{~Vm}^{-1}$$, then what is the magnetic field vector at that point?

$$2 \times 10^{-8} \mathrm{~T}$$

$$\frac{1}{2} \times 10^{-8} \mathrm{~T}$$

$$2 \mathrm{~T}$$

$$\frac{1}{2} \mathrm{~T}$$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

-0

What feature of the infrared waves make it useful for the haze photography?

Since it is invisible

Since it has large wave length

Since it is absorbed by the medium

Since it has high frequency

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