ध्वनि अधिकतम गति से चलती ह� – McqOptions

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1.	ध्वनि अधिकतम गति से चलती है ?
A.	जल में
B.	स्टील में
C.	शून्य में
D.	हाइड्रोजन में
Answer» C. शून्य में

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