Scientists have detected multiple radio bursts from deep space.

The radii of curvature of the lenses determine the focal length of the camera.

I have two radio alarm clocks in my bedroom.

I used to listen to music on radio cassette players when I was a teenager.

I used to listen to music on radio cassette recorders when I was a kid.

The radiation belts around the Earth protect us from harmful solar radiation.

Scientists use radio collars to track the movement of animals in the wild.

I have two radio alarms in my bedroom.

The radio compasses on the ship were used for navigation.

The radical anions are highly reactive species.