Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 10

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

Electromagnetic waves propagate

A
at the same speed in a dielectric

B
faster in a dielectric

C
slower in a dielectric

D
None of these

Solution

Speed of light is inversely proportional to square root of dielectric constant. Hence it decreases in dielectric.
Question 2
1 / -0

Electromagnetic waves

A
cannot form standing waves as they change phase while propagating

B
cannot form standing waves as they can only move in one direction

C
can form standing waves on getting reflected

D
None of these

Solution

Standing waves are formed when two sinusoidal wave trains of the same frequency are moving in opposite directions in the same space and interfere with each other. EM waves can be standing waves when electromagnetic waves reflected from the end of a transmission line.
Question 3
1 / -0

The intensity of a plane electromagnetic wave is proportional to

A
Electric field cubed

B
1/ Electric field squared

C
Electric field squared

D
Electric field

Solution

I = ϵ_oE²_rmsc
Question 4
1 / -0

Light from the star Sirius takes 8.61 years to reach the earth. What is the distance from earth to Sirius in kilometers?

A
8.15 × 10¹³km

B
7.95 × 10¹³km

C
7.85 × 10¹³km

D
8.05 × 10¹³km

Solution

distance = speed × time = 3 × 10⁸ × 8.61 × 365 × 24 × 3600 = 8.15 × 10¹⁶m = 8.15 × 10¹³km