[1 Mark Questions]

Question 11 Mark

What is meant by rarer and denser medium?

Answer

Rarer medium: The medium in which the velocity of sound increases compared to other medium is called rarer medium. (Water is rarer compared to air for sound).
Denser medium: The medium in which the velocity of sound decreases compared to other medium is called denser medium. (Air is denser compared to water for sound)

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Question 21 Mark

State ‘Laws of reflection’.

Answer

The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
The angle of incidence ∠i is equal to the angle of reflection ∠r.

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Question 31 Mark

State the laws of reflection of sound.

Answer

The distance travelled by a sound wave in unit time is called the velocity of a sound wave.
$
\text { Velocity }=\frac{\text { Distance }}{\text { Time taken }}
$

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Question 41 Mark

Define velocity of a sound wave.

Answer

The distance travelled by a sound wave in unit time is called the velocity of a sound wave.
$
\text { Velocity }=\frac{\text { Distance }}{\text { Time taken }}
$

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Question 51 Mark

Define wave velocity.

Answer

The velocity with which the wave travels through the medium is called wave velocity.

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Question 61 Mark

Define particle velocity.

Answer

The velocity with which the particles of the medium vibrate in order to transfer the energy in the form of a wave is called particle velocity.

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Question 71 Mark

Write down the difference between the sound and light waves.

Answer

Sound	Light
1. Medium is required for the propagation	1. Medium is not required for the propagation.
2. Sound waves are longitudinal.	2. Light waves are transverse.
3. Wavelength ranges from 1.65 cm to 1.65 m.	3. Wavelength ranges from $4 \times 10^{-7} m$ to 7 to 1.65 m .
4. Sound waves travel in the air with a speed of about $340 ms^{-1}$ at NTP.	4. Light waves travel in the air with a speed of $3 \times 10^8 ms^{-1}$

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Question 81 Mark

What is the effect of pressure on the speed of sound in gas?

Answer

The increase of pressure has no effect on the speed of sound in a gas.

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Question 91 Mark

Suppose you and your friend are on the Moon. Will you be able to hear any sound produced by your friend?

Answer

As the Moon does not have air, you will not be able to hear any sound produced by your friend.
Hence, you understand that the sound produced due to the vibration of different bodies needs a material medium like air, water, steel, etc, for its propagation.
Hence, sound can propagate through a gaseous medium or a liquid medium or a solid medium.

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Question 101 Mark

What is the minimum distance between two points in a wave having a phase difference of 2π?

Answer

The minimum distance is the wavelength.

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Question 111 Mark

How does sound reach our ears from various sources?

Answer

Sound reaches our ears in the form of transverse waves or vibrations from its source of production.

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Question 121 Mark

In which type of media, can longitudinal waves be propagated?

Answer

Longitudinal waves can be propagated through solids, liquids and gases.

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Question 131 Mark

What is sound? Is it a force or energy?

Answer

Sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. Sound is not a force, it is an energy.

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Science [1 Mark Questions]

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