Two open organ pipes of length $60 \,cm$ and $90 \,cm$ resonate at $6^{\text{th}}$ and $5^{\text{th}}$ harmonics respectively. The difference of frequencies for the given modes is . . . . . $Hz$.
(Velocity of sound in air $= 333 \,m/s$)
(Velocity of sound in air $= 333 \,m/s$)
- A$740$
- B$730$
- C$720$
- D$710$
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