1. An ultraviolet lamp has a frequency of 1 X 1015 Hz. Calculate the wavelength of the light if it travels at 3 X 108 m s-1.
2. A radio station broadcasts its radio signal at a frequency of 97.7 MHz.
(a) What speed do the radio waves at?
(b) Calculate the wavelength of the waves.
(c) Calculate the time it takes the radio waves to travel 100 km?
3. An infrared source emits waves with a wavelength of 100 μm. Calculate the frequency of these waves.
4. Gamma rays travel from the Sun at a speed of 3 X 108 ms-1.
(a) Calculate the time it takes for the rays to reach Earth if the Sun is
1.5 X 1011 m away.
(b) Calculate the frequency of the gamma rays if they have a wavelength
of 3 X 10-12 m.
5. A mobile phone network uses microwaves with a frequency of 1800 MHz.
(a) Calculate the wavelength of the microwaves.
(b) Calculate the time it takes for the waves to travel from the phone to a receiving mast 5 km away.
