Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Visible light is due to

A
electric field oscillations

B
magnetic field oscillations

C
oscillations of electric and magnetic fields in the same direction

D
oscillations of electric and magnetic fields in mutually perpendicular directions

Solution

Visible light is the electromagnetic radiations in which oscillating electric field and the magnetic field are perpendicular to each other; both are also perpendicular to the direction of propagation of the wave.
Question 2
1 / -0

If B is the magnetic field, E is the electric field and c is the speed of light in an electromagnetic wave, then which of the following relations is correct?

A
c = E/B

B
c = BE

C
c = B/E

D
c = 1/EB

Solution

The speed of electromagnetic wave is given by the ratio of electric field to the magnetic field, i.e. c = E/B.
Question 3
1 / -0

Which of the following statements is false?

A
Sun is a natural source of UV radiations.

B
UV radiations have wavelengths extending from 200 nm to 400 nm.

C
UV radiations are useful in astronomy.

D
UV radiations are used for sterilisation of water.

Solution

Ultraviolet astronomy is the observation of electromagnetic radiation at ultraviolet wavelengths between approximately 10 and 320 nanometres, shorter wavelengths (higher energy photons) are studied by X-ray astronomy and gamma ray astronomy. Light at these wavelengths is absorbed by the Earth's atmosphere, so observations at these wavelengths must be performed from the upper atmosphere or from space.