A sound source A and a reflecting surface B move directly towardeach other. Relative to the air, the speed of source A is 29.7 m/s,the speed of surface B is 63.5 m/s, and the speed of sound is 330m/s. The source emits waves at frequency 1350 Hz as measured in thesource frame. In the reflector frame, what are (a) the frequencyand (b) the wavelength of the arriving sound waves? In the sourceframe, what are (c) the frequency and (d) the wavelength of thesound waves reflected back to the source?
