Read the summary and the most important questions on Reader BP&SE Sound

• 1 The built environment and sound

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• What two aspects can be distinguished concerning sound in buildings?

  Noise nuisance and acoustical quality of a room

• 1.2 Propagation of sound in air

• What is a longitudinal wave?

  The direction in which they move is the same as or opposite to the direction in which the sound propagates

• What is a transverse wave?

  The direction of the movement of the particles is perpendicular to the direction of propagations

• What is the speed at which the vibration is passed in the air?

  344 m/s, the propagation velocity (c)

• 1.3 Sound pressure

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• What is sound pressure?

  The strength of sound is described as a measure of the pressure change as a result of a sound source

• 1.4 Sound pressure level

• What is the formula for sound pressure level?

  L_p = 10log (p_eff^2/p_0^2)
  
  p_0 = reference sound pressure = 2*10^-5 Pa

• 1.6 Sound power

• What is sound power?

  The strength of sound is described as a measure of the energy flow that represents the sound. Sound is an energy flow: it can be expressed as an amount of energy per unit of time. Unit is Watt

• 1.8 Sound intensity

• What is sound intensity?

  The sound intensity is the amount of sound power on a (imaginary) surface of 1 m2. This plane has a certain place, but also a certain direction. The sound intensity is dependent on location and direction.

• 1.9 Sound intensity level

• What is the formula for the sound intensity level?

  L_I = 10 log(I/I_0) [dB]

• 2 Mankind and sound

• 2.1 The human ear

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• What is the outer ear?

  The outer ear and ear canal form the external ear. The auricle helps to determine the direction of the sound. The ear canal acts as a frequency-selective pipe. Between the external ear and the middle ear is the eardrum (the barometer)