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Science CBSE Homework Assignments
Class 8
Sound
Audible and inaudible sounds
1.
Ultrasound
Task:
4
m.
1
.
Pitch of sound is determined by its
frequency
amplitude
speed
loudness
2
.
Ultrasound has a frequency of vibration
below 20 Hz
between 500 and 10,000 Hz
between 20 and 20,000 Hz
above 20,000 Hz
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