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Subjects
Science CBSE
Class 9
Sound
Production, propagation and types of sound
4.
Frequency of sound wave
Exercise condition:
2
m.
Choose the correct answer
:
1
. The frequency of sound is
20 Hz
Audible sound
Inaudible sound
.
2
. The frequency of sound is
5 Hz
Ultrasound
Infrasound
.
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