Electromagnetic Waves (NEET Physics): Questions 9 - 14 of 31

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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

Question number: 10

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If TV signals are to b received by the ground waves with in a range D, the height of the TV tower should be, (R is the radius of earth)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 11

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Which of the following waves have minimum frequency?

Choices

Choice (4) Response

a.

Audible waves

b.

Radio waves

c.

Microwaves

d.

Ultrasonic waves

Question number: 12

» Electromagnetic Waves » Electromagnetic Spectrum » X-Rays

MCQ▾

Question

If λ = 10 Å, then it correspond to

Choices

Choice (4) Response

a.

X-rays

b.

Infrared waves

c.

Microwaves

d.

Ultraviolet waves

Question number: 13

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

The intensity of light from a source is Equation . Find the amplitude of electric field in this-wave-

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 14

» Electromagnetic Waves » Electromagnetic Spectrum » Ultraviolet

Assertion-Reason▾

Assertion (Ꭺ)

Ultraviolet radiations are of higher frequency waves and are dangerous to human being.

Reason (Ꭱ)

Ultraviolet radiations are absorbed by the atmosphere.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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