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Class 12 Exam  >  Class 12 Questions  >  Which type of waves shows the property of pol... Start Learning for Free
Which type of waves shows the property of polarization?
  • a)
    Infrared
  • b)
    Longitudinal
  • c)
    Transverse
  • d)
    Microwave
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which type of waves shows the property of polarization?a)Infraredb)Lon...
Only transverse waves show the property of polarization. Their vibrations can occur in all directions perpendicular to the direction of travel. The longitudinal, infrared, and microwaves do not show the property of polarization.
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Which type of waves shows the property of polarization?a)Infraredb)Lon...
Polarization of Waves

Introduction:
Waves are classified based on their properties, such as the direction of oscillation and the direction of propagation. One property that certain waves can exhibit is polarization. Polarization refers to the orientation of the electric field vector associated with a wave. Only transverse waves can exhibit polarization.

Transverse Waves:
Transverse waves are characterized by oscillations that are perpendicular to the direction of wave propagation. In these waves, the particles of the medium vibrate in a direction perpendicular to the direction the wave is traveling. Examples of transverse waves include electromagnetic waves (such as light), water waves, and seismic S-waves.

Polarization:
Polarization refers to the alignment of the electric field vector of a wave in a particular direction. It occurs when the electric field vector oscillates in a single plane perpendicular to the direction of wave propagation. This alignment can be linear, circular, or elliptical, depending on the orientation of the electric field vector.

Types of Polarization:
1. Linear Polarization: In linearly polarized waves, the electric field vector oscillates in a single plane. This can be achieved by passing a transverse wave through a polarizing filter, which allows only the electric field vector aligned in a particular direction to pass through.

2. Circular Polarization: In circularly polarized waves, the electric field vector rotates in a circular pattern as the wave propagates. This can be achieved by superposing two perpendicular linearly polarized waves with a phase difference of 90 degrees.

3. Elliptical Polarization: In elliptically polarized waves, the electric field vector traces out an elliptical pattern as the wave propagates. This can be achieved by superposing two perpendicular linearly polarized waves with a phase difference other than 90 degrees.

Answer: Option C - Transverse Waves
Among the given options, transverse waves are the only type that can exhibit polarization. Infrared waves, microwave, and longitudinal waves (such as sound waves) are not transverse waves and therefore cannot exhibit polarization.
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Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. In the microwave oven,

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Which type of waves shows the property of polarization?a)Infraredb)Longitudinalc)Transversed)MicrowaveCorrect answer is option 'C'. Can you explain this answer?
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