Question

With the increase in temperature, the frequency of the sound from an organ pipe :

• A. Decreases
• B. Increases
• C. Remain unchanged
• D. Changes erratically

Answer 1

Answer: (B)

Increases

Frequency of sound in open pipe $\nu =\frac{nv}{2L}$
where, velocity of sound in air $v\propto \sqrt{T}$
Thus, velocity of sound in air increases with increase in temperature and so the frequency also increases.