Sound And Hearing

 SOUND
• Sound is a type of energy that involves the vibration of
molecules in a medium, such as air or water.

• Sound is transmitted through a medium as a pressure wave.

• Sound vibrations are caused by an initial disturbance in a
medium that causes molecules around it to vibrate.
Examples: a guitar string being plucked, vocal chords
vibrating, vibrations of a diaphragm in a stereo speaker

• The rate at which sound vibrates is called the frequency of
the sound. Frequency is measured in Hertz (Hz).

• The amplitude of a sound wave is related to the loudness of
the sound. Loudness is measured in decibels.

HEARING

• Our ears receive and transmit sound wave vibrations to our
brains so that we can interpret the sounds around us.


• Humans can hear a range of frequencies from 20 to 20,000
Hz. Different animals can hear different ranges of sound
frequencies.


• Loud or high‐frequency sounds can cause damage to our
ears, causing hearing damage or hearing loss.


Credit:http://siemensscienceday.discoveryeducation.com/support-center/pdf/5-Minute_soundandhearing.pdf