10.Sound-Production of sound. We hear many sounds all day. Eg.people-talk rattling –vehicles...
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10.Sound-Production of sound
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Transcript of 10.Sound-Production of sound. We hear many sounds all day. Eg.people-talk rattling –vehicles...
10.Sound-Production of sound
• We hear many sounds all day.• Eg.people-talk• rattling –vehicles• clanging –pots and pans• ringing-bells• rustling-leaves• melodious music-radio
Vibration
• Vibration is necessary for sound to be produced.
• What is a vibration?• When an object moves very
fast following a fixed path from one side to the other and then back again,we say that it vibrates.
Period of oscillation- The time taken by a pendulum to
complete one swing or oscillation is called period of oscillation.
Frequency- The number of oscillations that an
object completes in one second is called Frequency
Amplitude – The maximum distance that the
pendulum moves away from its position at rest is called the amplitude of oscillation.
AUDIBLE -INAUDIBLE SOUNDS
• The human hear a sound of frequency between 20Hz to20000Hz.These sounds are called audible sounds.
• The human can not hear the sounds of frequency less than 20Hz and more than 20000Hz. These sounds are called inaudible sounds.
• Dogs,bats can hear ultrasonic sounds
