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GRADE 7 (ALL QUARTERS)
Science
sound
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Cards (14)
Audible
Frequency
is between 20Hz to 20,000 Hz
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Pitch
The sensation of the frequency of a sound
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Infrasonic
sound waves are below 20 Hz
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How humans produce sound
Our
ear
detects
sound waves
when
vibrating air particles
cause
our
eardrum
to
vibrate
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If the amplitude of a sound wave is
large
, then the loudness of sound will be
more
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Sound
A type of energy made by vibrations
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Sound "
quality
" or "
timbre
" describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness
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Frequency
The number of
waves
(
cycles
) per given time
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Soundwaves
Longitudinal
waves
Sinusoidal
waves
with definite frequency, amplitude, and wavelength
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How sound is produced
When an object
vibrates
, it causes movement in surrounding
air molecules.
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Ultrasonic
sound waves are above 20,000 Hz
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Timbre
A general term for the distinguishable characteristics of a tone
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Sound
requires a medium to travel
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Amplitude
The loudness or the amount of maximum displacement of vibrating particles of the medium from their equilibrium position when the sound is produced
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