An ultrasound transducer used in a medical laboratory emits sound waves of frequency 40kHz.
(a) Calculate the time period of these waves.
(b) How many complete waves are emitted in 2.5ms?
(c) An audible sound of frequency 500Hz is required to produce the same number of waves as in part (b). How long would this audible sound have to be produced?
(d) Compare the two times obtained in parts (b) and (c) and state what this indicates about the effect of frequency on the rate of energy emission by a source.