Question

A pipe open at both ends has a length of 1m. The air column in the pipe can not resonate for a frequency (Neglect end correction, speed of sound in air = 340 m/s)

Options

• 510 Hz

• 170 Hz

• 85 Hz

• 340 Hz

Answer 1

170 Hz

Explanation:

Fundamental frequency

n = `V/(2ℓ) = 340/(2 xx 1)` = 170 Hz

It can resonate only at integral multiples of 170 Hz.

∴ It can not resonate at 85 Hz.