स्टेथोस्कोप ध्वनि के किस स – McqOptions

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1.	स्टेथोस्कोप ध्वनि के किस सिद्धांत पर कार्य करता है -
A.	परावर्तन
B.	ध्रुवण
C.	अपवर्तन
D.	विवर्तन
Answer» B. ध्रुवण

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