1. A tuning fork vibrates 200 times per second and sends out a compressional wave that travels with a speed of 340 m/s. Find (a) the period and (b) the wavelength. 2. The velocity of light in a liquid is 0.80 as fast as it is in air. What is the index of refraction of the liquid? 3. What is the wavelength in air under standard conditions of a compressional wave whose frequency is 250 per second? Assume that the bulk modulus for air is 1.40 x 10' dyn/cm and the density of air is 1.29 g/L