More Uses of EM Waves

Radiographers

________ use X- rays and gamma rays to treat people with cancer.

Ultraviolet radiation

________ is produced by the sun, and exposure to it is what gives people a suntan.

X rays

________ pass easily through flesh but no so easily through denser material like bones or metal.

Security pens

________ can be used to mark property with you name, under UV light the ink will glow, but its invisible otherwise.

Fluorescence

________ is a property of certain chemicals, where ultra- violet radiation is absorbed and then visible light is emitted.

Gamma radiation

________ can also be used as a medical tracer- this is where a gamma- emitting source is injected into the patient, and its progress is followed around the body.

Fibre optic cables

________ use visible light to transmit data.

Radiographers

________ in hospitals take X- ray photographs of people to see if they have any broken bones.

X rays

Both ________ and gamma rays can be harmful to people so radiographers wear lead aprons and stand behind a lead screen or leave the room to keep their exposure to them to a minimum.

Ultraviolet radiation

________ gives you a suntan.

X rays

________ and gamma rays are used in medicine.