Electromagnetic Waves (NEET Physics): Questions 6 - 9 of 31

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Question number: 6

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Light wave is travelling along + y-direction. If the corresponding E vector at that time is along + x-direction, B vector must be directed along.

Choices

Choice (4) Response
a.

Y-axis

b.

X-axis

c.

+ Z axis

d.

- Z axis

Question number: 7

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

Choose the wrong statement for E. M. wave.

Choices

Choice (4) Response
a.

They are transverse

b.

They are produced by accelerated charges

c.

They travel with same speed in all medium

d.

They travel in vacuum with the speed of light

Question number: 8

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ϵ r = 4.0. Then the wrong statements are

(1) Wavelength is doubled and the frequency remains unchanged

(2) Wavelength is doubled and frequency becomes half

(3) Wavelength and frequency both remain unchanged

(4) Wavelength is halved and frequency remains unchanged

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response
a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

Question number: 9

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

Choices

Choice (4) Response
a.

1.8 x 10 2 m/s

b.

1.8 x 10 8 m/s

c.

13.6 x 10 6 m/s

d.

3.6 x 10 8 m/s

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