I am quite capable of using physics formulae to answer exam questions but I found this question in my textbook and I wasn't sure how to do it:
"The waves that carry Radio 4 on the long-wave band have a wavelength of 1500 metres. Calculate the frequency of these waves."
How can I work out the frequency of the wave when I've only been given the wavelength? Don't I also need to know the wave speed?
Help please?