Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

A drum is beaten in a vacuum and we are unable to hear it. This is because:

1
Sound cannot travel in vacuum
2
Frequency of vibration of sound is low
3
Amplitude of vibration of sound is high
4
 More than one of the above   
5
None of the above
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