in which one of the following regions of the

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. Infrared

D. Radio waves

Answer : Microwaves

Solution :
Molecular spectra due to vibrational motion lie in the microwave region of $$EM$$ -spectrum. Due to Kirchhoff’s law in spectroscopy the same will be absorbed.

Releted MCQ Question on
Electrostatics and Magnetism >> Electromagnetic Waves

Releted Question 1

Out of the following options which one can be used to produce a propagating electromagnetic wave?

A. A stationary charge

B. A chargeless particle

C. An accelerating charge

D. A charge moving at constant velocity

View Answer

Releted Question 2

The energy of the $$EM$$ waves is of the order of $$15\,keV.$$ To which part of the spectrum does it belong?

A. X-rays

B. Infrared rays

C. Ultraviolet rays

D. $$\gamma $$-rays

View Answer

Releted Question 3

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

A. the frequency of the microwave must match the resonant frequency of the water molecules

B. the frequency of the microwave has no relation with natural frequency of water molecules

C. microwave are heat waves, so always produce heating

D. infra-red waves produce heating in a microwave oven

View Answer

Releted Question 4

The electric field associated with an electromagnetic wave in vacuum is given by $$E = \hat i40\cos \left( {kz - 6 \times {{10}^8}t} \right),$$ where $$E,z$$ and $$t$$ are in $$volt/m,$$ metre and second respectively. The value of wave vector $$k$$ is

A. $$2\,{m^{ - 1}}$$

B. $$0.5\,{m^{ - 1}}$$

C. $$6\,{m^{ - 1}}$$

D. $$3\,{m^{ - 1}}$$

View Answer

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

Releted MCQ Question on
Electrostatics and Magnetism >> Electromagnetic Waves

Out of the following options which one can be used to produce a propagating electromagnetic wave?

The energy of the $$EM$$ waves is of the order of $$15\,keV.$$ To which part of the spectrum does it belong?

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

The electric field associated with an electromagnetic wave in vacuum is given by $$E = \hat i40\cos \left( {kz - 6 \times {{10}^8}t} \right),$$ where $$E,z$$ and $$t$$ are in $$volt/m,$$ metre and second respectively. The value of wave vector $$k$$ is

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Electromagnetic Waves

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

Releted MCQ Question on Electrostatics and Magnetism >> Electromagnetic Waves

Out of the following options which one can be used to produce a propagating electromagnetic wave?

The energy of the $$EM$$ waves is of the order of $$15\,keV.$$ To which part of the spectrum does it belong?

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

The electric field associated with an electromagnetic wave in vacuum is given by $$E = \hat i40\cos \left( {kz - 6 \times {{10}^8}t} \right),$$ where $$E,z$$ and $$t$$ are in $$volt/m,$$ metre and second respectively. The value of wave vector $$k$$ is

Practice More Releted MCQ Question on Electromagnetic Waves

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Releted MCQ Question on
Electrostatics and Magnetism >> Electromagnetic Waves

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Electromagnetic Waves