A bat emits an ultrasonic pulse of frequency 40kHz as it flies just above the surface of a still pond. The speed of sound in air is 340ms−1, while in water it is 1480ms−1.
(a) Calculate the wavelength of the ultrasonic pulse in air.
(b) Calculate its wavelength in water.
(c) Show that the ratio of the wavelengths obtained in parts (a) and (b) is equal to the ratio of the speeds of sound in the two media.