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Note on Sound and its Properties

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A sound is a form of energy which gives a sensation of hearing. The sound is produced due to the vibration of the body. Sound travels through a medium by means of waves set up in the medium. The following are the characteristics of sound;

  • It is produced due to the vibration of the body.
  • It needs a medium for propagation. It cannot travel through a vacuum.
  • Its speed is different in a different medium. Its velocity is the highest in solids and slowest in gases.
  • Sound travels from one place to another in the form of a longitudinal wave.
  • Sound follow reflection and refraction phenomenon.

Relation between frequency and time period

By the definition of frequency,

∴ f vibrates are completed in one second.

∴ 1 vibration is completed in 1/f second.

But, time to complete one vibration is its time period (T)

∴ T = 1/f

Factors affecting velocity of sound in gases

Temperature: The velocity of sound is directly proportional to square root of the absolute temperature of the gas. Thus, higher the temperature, higher the velocity of sound.

∴ Velocity of sound ∝

Density: The velocity of sound in a gas is inversely proportional to the square root of the density of the gas.

∴ Velocity of sound ∝

Humidity: As the density of water vapour is less than that of dry air, the density of moist air is lesser than that of dry air. Sound travels faster in moist air than in dry air as the velocity of sound in a gas is inversely varies inversely to square root of the density of the gas.

The direction of wind: Direction of wind also affect the velocity of sound. The velocity of sound is higher in the direction of wind and slower in the opposite direction of the wind.

  • The velocity of sound is directly proportional to square root of the absolute temperature of the gas.
  • The velocity of sound in gas is inversely proportional to the square root of the density of the gas.
  • Sound travels faster in moist air than in dry air as the velocity of sound in gas is inversely varies inversely to square root of density of the gas.
  • Sound transmits from one place to another in the form of a longitudinal wave.
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Very Short Questions

Velocity of sound in gas depends on the following factors,

  • Density of gas
  • Temperature of gas
  • Humidity of gas
  • Direction of wind

Sound waves are mechanical waves so they need material medium to carry energy from the sources. Hence, sound wave can not travel in vacuum.

A sensation caused in the ear by the vibration of the air and any other medium is called sound. It is a form of energy. The sound is produced due to the vibration of the molecular medium (i.e. objects).

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  • The form of energy that is produced due to the vibration of the body is known as

    Light energy
    Sound energy
    Nuclear energy
    Wind energy
  • Sound cannot travel through

    Air
    Vacuum
    Solid
    Liquid
  • The velocity of sound is highest in

    Soil
    Gas
    Liquid
    Solids
  • The velocity of sound is lowest in

    Gases
    Liquid
    Solid
    Rock
  • Sound transmits from one place to another in the form of a

    None of them
    Longitudinal wave
    Transverse wave
    Both of them
  • When the density of air increases then the velocity of sound in air

    Decreases
    Remains uneffected
    Increases
    Becomes 0
  • When the temperature of gas increases then the velocity of sound in gas

    Remains uneffected
    Decreases
    Increases
    Becomes 0
  • The velocity of the sound is higher if the direction of wind is

    In the same direction
    In upward direction
    In downward direction
    In opposite direction
  • The velocity of the sound is lesser if the direction of the wind is

    In the similar direction
    In the opposite direction
    In equivalent direction
    In the same direction
  • Sound travels faster in

    Cool air
    Air with less density
    Dry air
    Moist air
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