Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

State the part of the electromagnetic spectrum to which 21 cm wavelength emitted by atomic hydrogen in interstellar space belongs to?

A
Ultraviolet

B
Radio

C
Visible

D
Microwave

Solution

Wavelength range of radio waves is 0.1 m to 600 m
Question 2
1 / -0

State the part of the electromagnetic spectrum to which 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen known as Lamb shift) belongs to?

A
Ultraviolet

B
Microwave

C
Radio

D
Visible

Solution

Radio waves are the radiation arising from two close energy levels in hydrogen (known as Lamb's shift)
Question 3
1 / -0

Part of the electromagnetic spectrum to which 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the Universe] belong to is

A
Microwave

B
Ultraviolet

C
Gamma rays

D
Radio

Solution

2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the Universe] belongs to microwaves.
Question 4
1 / -0

Part of the electromagnetic spectrum to which 14.4 keV [energy of a particular transition in ⁵⁷Fe nucleus associated with a famous high resolution spectroscopic method (Mossbauer spectroscopy)] belongs to is

A
Gamma rays

B
Ultraviolet rays

C
X-rays (or soft γγ -rays)

D
Microwaves

Solution

14.4 keV [energy of a particular transition in ⁵⁷Fe nucleus associated with a famous high resolution spectroscopic method (Mossbauer spectroscopy)] belongs to X-ray region.
Question 5
1 / -0

Long distance radio broadcasts use short-wave bands because

A
Thermosphere reflects waves in these bands

B
Ionosphere reflects waves in these bands

C
Stratosphere reflects waves in these bands

D
Troposphere reflects waves in these bands

Solution

Long distance radio broadcasts use shortwave bands because only these bands can be reflected by the ionosphere.