PYQ NEET- دوغلے اور لہریں L-6
سوال: ایک بند ارگن پائپ کا $4^{\text {th }}$ اوورٹون ایک کھلے پائپ کے $3^{\text {rd }}$ اوورٹون کے برابر ہے۔ بند پائپ کی لمبائی اور کھلے پائپ کی لمبائی کا تناسب ہے:
A) $8: 9$
B) $9: 7$
C) $9: 8$
D) $7: 9$
A) $8: 9$
B) $9: 7$
C) $9: 8$
D) $7: 9$
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