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Which of the following characteristic(s) of a sound wave determine the loudness of the sound? (i) Frequency (ii) Amplitude (iii) Timbre

Which of the following characteristic(s) of a sound wave determine the loudness of the sound? (i) Frequency (ii) Amplitude (iii) Timbre Correct Answer Only (ii)

The correct answer is Only (ii)​.

Amplitude is the characteristic of a sound wave that determines the loudness of the sound.

Additional Information

Sound

  • Sound is longitudinal mechanical waves.
  • Sound is produced due to vibration.
  • Characteristics of sound waves are Intensity or loudness, Pitch, Quality (Timbre)
  • The intensity of sound at any point in space is defined as the amount of energy passed normally per unit area held around that point per unit time.
  • The unit of intensity of sound - Decibel (db)
  • Pitch of a sound that distinguishes a sharp sound from a grave sound. Pitch depends on frequency.
  • Quality (Timbre) enables us to distinguish between sounds produced by two sources having the same intensity and pitch.
  • When sound enters from one medium to another medium, its speed and wavelength change but the frequency remains unchanged.
  • As the density of the medium increases speed of sound also increases.
  •  As the temperature of the medium increases speed of sound also increases.
  • Speed of sound remains unchanged by the increase or decrease of pressure.
  • The repetition of sound due to the reflection of sound waves is called an echo and the minimum distance required for the production of echo is 17m.
  • Persistence of ear is 1/10 sec

​Important Points

  • Study of sound - Acoustics
  • Speed of sound is maximum in solids and minimum in gases
  • Sound waves cannot travel through vacuum.
  • Speed of sound in air - 343 m/s
  • Speed of sound in water - 1483 m/s
  • Speed of sound in iron - 5130 m/s
  • The organ in human beings which helps to produce sound - Larynx

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