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Define frequency

• the number of pressure oscillations in one second

• the distance between two successive areas of high pressure or low pressure

• the change in frequency of sound close by the motion of either the source or the detector

• an organ that detects sound. It turns sound energy into electrical energy.

What is wavelength

• the number of pressure oscillations in one second

• the distance between two successive areas of high pressure or low pressure

• the change in frequency of sound close by the motion of either the source or the detector

• an organ that detects sound. It turns sound energy into electrical energy.

What is the unit measure of sound

• decibel (BD)

• Joule (J)

• Meter (m)

• Kilogram (Kg)

sound can’t travel throw vacuum

• True

• False

Arrange the transmission speed of sound from highest to lowest :

• 1-gas

  2- solid

  3- liquid

• 1-solid

  2-gas

  3-liquid

• 1-liquid

  2-solid

  3-gas

• 1-solid

  2-liquid

  3-gas

the Three bones in the middle ear 

•  Malleus

• Incus

• Stapes

How can we find wavelength

What type of wave is sound wave ?

• Transference

• Interference

• Longitudinal

• water wave

What is the speed sound in the air?

• 343 m/s

• 240 m/s

• 0 m/s

• 67 m/s

How do you hear the sound?

• Solids

• using Doppler effect

• from Vibrations in the eardrum

• by the Sun light