In a open organ pipe the frequency of the wave is n= Vt/λ where Vt is the velocity of wave at temperature t and λ=2L is the wavelength of the vibrating wave. If temperature of air inside the organ pipe changes, the velocity of wave also changes, since V∝ √T.
On comparing with the standard wave equation
we see that, Amplitude = A = 3.0 cm
Wavelength = λ=1/0.50 cm = 2.0 cm, and the frequency
The speed of the wave is V =νλ
= (50 s-1) (2.0cm) = 100 cm s-1
