A turning fork produces resonance in a tube at 40cm and 85cm respectively.calculate wave length of the turning fork ?

To calculate the wavelength of the tuning fork, we can use the formula:

wavelength = 2 * length of tube

Given that the tuning fork produces resonance at 40cm and 85cm, we can calculate the wavelength for each case:

For the first case:
wavelength = 2 * 40cm = 80cm

For the second case:
wavelength = 2 * 85cm = 170cm

Therefore, the wavelength of the tuning fork is 80cm and 170cm for the two different tube lengths.