Calculate the bulk modulus of air from the following data about a sound wave of wavelength 35 cm travelling in air. The pressure at a point varies between (1.0 × 105 ± 14) pa and the particles of the air vibrate in simple harmonic motion of amplitude 5.5 × 10-6 m.
Given:
Wavelength of sound wave
Pressure amplitude
Displacement amplitude of the air particles
Bulk modulus is given by:
On substituting the respective values in the above equation, we get:
⇒
Hence, the bulk modulus of air is