Question

Astronomers often scan the sky using devices called radio telescopes. What can you conclude about these devices?

A
They send radio broadcasts out to distant stars and planets.

B
They pick up the radio waves emitted by stars.

C
They are less powerful than optical telescopes.

D
They can detect ultraviolet radiation.

Answer 1

B

Radio telescopes receive (pick up) radio waves emitted by astronomical objects. They do not broadcast signals to stars, and they are designed for radio, not ultraviolet, wavelengths.