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Sound Waves
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General Science for Class 7
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Sound Waves
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Sound Waves
Sound loses more energy in
air
vacuum
liquid
solid
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Sound Waves
The sequence of notes is known as
plain
scale
balance
proportion
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Sound Waves
20 dB has hundred times more energy than
10 dB
0 dB
5 dB
2 dB
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Sound Waves
Sound waves are converted by
speakers
computers
microphones
monitors
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Sound Waves
If frequency increases,
wavelength also increases
amplitude also increases
number of waves also increases
amplitude decreases
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Sound Waves
An example to demonstrate the effect of sound in vacuum is
vacuum bell jar
simple bell jar
air pump and ring
air pump and clock
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Sound Waves
Sound is measured by units that are called
Hertz (Hz)
Decibels (dB)
Meters (m)
Pascal (Pa)
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Sound Waves
An example of stringed instruments is
guitar
saxophone
drum
flute
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Sound Waves
Unwanted or unpleasant sounds are known as
music
noise
laugh
yawn
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Sound Waves
An example of ‘percussion’ is
flute
piano
drum
saxophone
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