which of the following statements is true 615028323

Which of the following statements is true?

A. The wavelength of microwaves is greater than that of UV-rays

B. The wavelength of IR rays is lesser than that of UV-rays

C. The wavelength of microwaves is lesser than that of IR rays

D. Gamma rays has largest wavelength in the electromagnetic spectrum.

Answer : Gamma rays has largest wavelength in the electromagnetic spectrum.

Solution :
$$G > X > U > V > I > M > R\,\left[ {{\text{frequency}}\,{\text{order}}} \right]$$

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

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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

Which of the following statements is true?

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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Which of the following statements is true?

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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Electrostatics and Magnetism >> Electromagnetic Waves

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Electromagnetic Waves