Which of the following uses gamma rays?

1.sterilisation

2.killing cancerous cells

3.detecting flaws in metals

Which of the following uses X-rays?

1.detecting flaws in metals

2.inspecting of luggage

3.checking welds

Which of the following waves will best penetrate fog or low cloud?

Which of the following uses visible light?

1.seeing things with the naked eye

2.transfer of thermal energy from a high temperature region to a low temperature region

3.transmitting signals through optical fibres

Which of the following uses infra-red radiation?

1.transfer of thermal energy from a high temperature region to a low temperature region

2.remote control

3.killing cancerous cells

When sections of large metal pipe have been welded together, they are checked to discover whether there are any cracks in the joints.

Which part of the electromagnetic spectrum is used for this purpose?

The diagram shows the main components of the electromagnetic spectrum in order of increasing frequency. Some of the components are labelled.

The component Q has frequencies below those of light.

What are the electromagnetic waves in component Q used for?

The Sun heats the Earth by electromagnetic radiation. Which part of the electromagnetic spectrum is responsible for most of this heating?

The diagram shows the electromagnetic spectrum with the blue end and the red end of visible light marked.

Which section of the spectrum has waves which have a long wavelength and can be produced by electrical oscillations in a circuit?

Which component of the electromagnetic spectrum is used in intruder alarms?

Visible light and gamma rays are both waves.

Which row is correct?