Question

In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption?

• A. Ultraviolet
• B. Microwaves
• C. Radio Waves
• D. Infrared

Answer 1

The correct option is B

Microwaves

The explanation of the correct answer.

In the case of option B,

Microwaves

1. Kirchhoff's law in spectroscopy can be used to explain the absorption of these vibrated molecules.
2. Because of the vibrational motion of the molecules, the molecular spectra will be in the microwave range.
3. As a result, absorption occurs in the microwave region of the electromagnetic spectrum due to the vibrational motion of the molecules.

The explanation of the incorrect answer.

In the case of option A,

Ultraviolet

1. Ultraviolet rays are a type of electromagnetic radiation that extends from the visible light spectrum to the X-ray region.
2. Harmful rays have a long-term effect on humans, causing skin and eye problems. Furthermore, it is a source of Vitamin D, which is essential for human growth.
3. The ozone layer in the atmosphere absorbs a substantial quantity of UV rays from the sun. UV rays can also be produced by black lights, mercury lamps, and tanning lights.

In the case of option C,

Radio Waves

1. Radio waves are electromagnetic waves with wavelengths that lie within the electromagnetic spectrum.
2. Among electromagnetic waves, radio waves have the longest wavelengths.
3. Radio waves, like all other electromagnetic waves, move at the speed of light. Radio waves are mainly produced when charged particles accelerate.
4. Transmitters create artificial radio waves, which are picked up by antennas or radio receivers.
5. Fixed or mobile radio communication, broadcasting, radar, and communication satellites are all common uses for radio waves.

In case of option D

Infrared

1. A considerable percentage of the Sun's energy is carried to Earth by infrared radiation.
2. At sea level, the irradiation of sunlight at its zenith is just over 1 kilowatt per square meter. There are 527 watts of infrared radiation, 445 watts of visible light, and 32 watts of UV radiation.
3. The amount of infrared energy absorbed and emitted has a big impact on the temperature of the Earth.
4. InfraredWavesBody Industrial, scientific, and therapeutic applications all use infrared light. Night-vision devices that use infrared illumination can be used to view people or animals without being noticed.

Hence, option B is the correct answer.