20 Hz से कम आवृत्ति की ध्वनि क� – McqOptions

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1.	20 Hz से कम आवृत्ति की ध्वनि कहलाती है
A.	ऑडियो लगता है
B.	इन्फ्रासोनिक
C.	अल्ट्रासोनिक
D.	सुपरसोनिक्स
Answer» B. इन्फ्रासोनिक

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