Question

radiation that falls at the high energy end of the electromagnetic spectrum has: been shown to have no effect on the incidence of cancer. a longer wavelength. been shown to cause cancer. a lower frequency.

Explanation:

High - energy electromagnetic radiation such as gamma rays and X - rays are ionizing radiation. Ionizing radiation can damage DNA and has been shown to cause cancer. Also, according to the electromagnetic wave formula $c = \lambda
u$ (where $c$ is the speed of light, $\lambda$ is wavelength and $
u$ is frequency), high - energy radiation has a higher frequency and a shorter wavelength.

Answer:

been shown to cause cancer.