posted by Erika .
Which radiation causes cancer? I think it is UV radiation, but I'm not sure.
A wave goes up and down 5 times in 10 seconds. what is the frequency of the wave in cycles per second (Hertz)
Ultraviolet waves shorter than about 350 nm can cause skin cancer.
Frequency (in Hz) equals 1/Period, and in this case the period is 2 seconds.