An organ pipe 40 cm long is open at both ends. The speed of sound in air is 360 m s⁻¹. The frequency of the second harmonic is __________ Hz.
Physics · Circular Motion
JEE Mains 8 April 2023 Shift 1 Morning Shift

Question

An organ pipe 40 cm long is open at both ends. The speed of sound in air is 360 m s⁻¹. The frequency of the second harmonic is __________ Hz.

G1 Physics · Accepted Answer

For an open organ pipe, fundamental frequency: f₁ = v/(2L) Given: v = 360 m s⁻¹ L = 0.40 m So, f₁ = 360/(0.80) = 450 Hz The second harmonic is f₂ = 2f₁ = 900 Hz Final value: 900