# How Well Do You Know Sound Waves?

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Sound waves are produced whenever a disturbance occurs in the air. Such disturbances are common in everyday life and include sound produced from playing musical instruments.

• 1.

### The fact that sound waves require a material medium for propagation make them

• A.

Transverse waves

• B.

Longitudinal waves

• C.

Electromagnetic waves

• D.

Mechanical waves

D. Mechanical waves
Explanation
Sound waves require a material medium, such as air, water, or solids, for propagation. This is because sound waves are the result of vibrations or disturbances in the particles of the medium. These vibrations travel through the medium in a wave-like manner, causing the particles to oscillate back and forth in the same direction as the wave. Therefore, sound waves are classified as mechanical waves, which are waves that require a material medium to propagate.

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• 2.

### That fact that sound waves travel in the direction of vibration of medium make them

• A.

Longitudinal waves

• B.

Electromagnetic waves

• C.

Mechanical waves

• D.

Transverse waves

A. Longitudinal waves
Explanation
Sound waves are longitudinal waves because they travel in the same direction as the vibration of the medium. In a longitudinal wave, the particles of the medium vibrate parallel to the direction of wave propagation. This means that as the sound wave travels through a medium, the particles of the medium move back and forth in the same direction that the sound wave is traveling. Therefore, the correct answer is longitudinal waves.

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• 3.

### Sound waves do have which of these properties?

• A.

Reflection

• B.

Diffraction

• C.

Rarefraction

• D.

Refraction

C. Rarefraction
Explanation
Sound waves do have the property of rarefaction. Rarefaction refers to the decrease in density of a medium caused by the passage of a sound wave. As a sound wave travels through a medium, it creates areas of high pressure (compression) and low pressure (rarefaction). The rarefaction regions are characterized by a decrease in the density of the medium, which causes the particles in the medium to spread out. This property of sound waves is important in understanding how they propagate and interact with different mediums.

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• 4.

### The distance between one compression to the other is

• A.

Amplitude

• B.

Wavelength

• C.

Period

• D.

Displacement

B. Wavelength
Explanation
The distance between one compression to the other is referred to as wavelength. Wavelength is a physical property of a wave and is defined as the distance between two consecutive points in a wave that are in phase. In the case of a compression wave, such as sound waves, the distance between two consecutive compressions is the wavelength. This property is important in understanding wave behavior and is commonly used to describe various types of waves, including electromagnetic waves and seismic waves.

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• 5.

### The movement of molecules towards each other causes

• A.

Compression

• B.

Rarefraction

• C.

Troughs

• D.

Crests

A. Compression
Explanation
The movement of molecules towards each other causes compression. When molecules are compressed, they are pushed closer together, resulting in an increase in density and pressure. This can occur in various contexts, such as in a gas being compressed into a smaller volume or in a sound wave where air molecules are compressed and create areas of higher pressure.

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• 6.

### The behaviour of a vibratory particle in sound waves is like

• A.

The heartbeat

• B.

A spiral spring

• C.

A wiper

• D.

B. A spiral spring
Explanation
A spiral spring is a suitable comparison for the behavior of a vibratory particle in sound waves because both exhibit similar characteristics. Just like a spiral spring oscillates back and forth when disturbed, a vibratory particle also moves in a similar manner when subjected to sound waves. The particle vibrates in a periodic motion, with its displacement from its equilibrium position changing over time. This comparison helps to understand the nature of sound waves and how particles interact with them.

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• 7.

### The fact that sound cannot travel through a far distance reveals that

• A.

It has long wavelength

• B.

It has short wavelength

• C.

It has long amplitude

• D.

It has long amplitude

A. It has long wavelength
Explanation
Sound waves travel through the vibration of particles in a medium. The wavelength of a sound wave is the distance between two consecutive points of similar phase. When sound travels over a long distance, it tends to spread out and become less intense. This phenomenon, known as sound attenuation, is more pronounced for sound waves with longer wavelengths. Therefore, the fact that sound cannot travel through a far distance suggests that it has long wavelengths.

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• 8.

### Which of these is not true about sound wave?

• A.

It require a medium for propagation

• B.

It can be polarised

• C.

It is a pressure wave

• D.

It is a mechanical wave

B. It can be polarised
Explanation
Sound waves cannot be polarized. Polarization refers to the alignment of the electric field vector of a wave in a specific direction. Sound waves are mechanical waves that require a medium for propagation, and they are pressure waves that travel through compressions and rarefactions in the medium. However, sound waves do not exhibit polarization because they do not have an electric field component.

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• 9.

### Which of these cannot be polarised?

• A.

Light wave

• B.

• C.

X-ray

• D.

Sound wave

D. Sound wave
Explanation
Sound waves cannot be polarized because polarization refers to the alignment of the electric field vector of a wave in a specific direction. Sound waves are mechanical waves that require a medium, such as air or water, to propagate. They do not have an electric field component, and therefore cannot be polarized.

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• 10.

• A.

Trumpet

• B.

Violin

• C.

Wall clock

• D.