वायु में ध्वनि तरंगें होती – McqOptions

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1.	वायु में ध्वनि तरंगें होती हैं
A.	आड़ा
B.	अनुदैर्ध्य
C.	विद्युत चुम्बकीय
D.	ध्रुवीकरण
Answer» B. अनुदैर्ध्य

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