The nature of sound wave

• What type of wave is sound?

  Mechanical wave
• a vibration that travel through the air or another medium and can be heard when they reach a person or animal's ear.

  Sound
• TRUE or FALSE

  Sound wave is also a longitudinal wave.

  True
• A region in a longitudinal wave where the particles are closest together.

  compression
• A region in a longitudinal wave where the particles are farthest apart.

  Rarefaction
• The sensation of a frequency is often referred to as the pitch of a sound.
• High pitch is equal to high frequency

  Low pitch is equal to low frequency
• Certain sound waves when played will simultaneously produce a particularly pleasing sensation called?

  Music
• Infrasonic has a frequency below 20Hz
• Ultrasonic has a frequency above 20000Hz
• Audible sound, the capacity of humans to hear, ranges from 21Hz - 19999Hz
• TRUE or FALSE

  Ears are a transducer

  TRUE
• It is not related to frequency but velocity of sound.

  Supersonic
• Sound travels approximately 330 m/s at STP.
• When any object travels at a speed more than the speed of sound, then we say that object is traveling at supersonic and a shock wave is created.
• The amount of energy that is transported past a given area of the medium per unit time is known as the intensity of the sound wave,
• Prolongation of sound in a hall eve though the source of sound is cut off.

  Reverberation
• Reflection of sound waves

  Echo
• Occurs when a reflected sound wave reaches the ear more than 0.1s after the original wave was heard.

  echo
• Takes time for reflected sound to die by 60 decibels from the cessation of the original sound signal.
• This unit indicates how loud a sound is.

  Decibels
• The human perception of sound as dissipated at eardrum.

  Loudness