Federica maestri
Assignment 2 1. 1. Gamma rays, X rays, Ultra Violet, Visible Light, Infra-Red, Microwaves and Radio Waves.

b. * They transfer energy from one place to another * They can all be reflected, refracted and diffracted
2.
Gamma | Radioactive substances like uraniumVery dangerous | xray | X ray tubesVery dangerous | uv | Very hot objects, sun, sparks, mercury lamps | visible | Hot objects, sun, fluorescent substances, lasers, LEDS | infrared | Warm or hot objects, sun, ions, fires, grills, toasters | Microwaves, tv, radio | Radio trasmitters, including radar, tv transmitter, microwaves, ovens, mobile phones, microwaves are dangerous when absorbed by body tissue ; cause heating |

3.
Smoke alarms contain a weak source made of Americium-241.
Alpha particles are emitted from here, which ionise the air, so that the air conducts electricity and a small current flows.
If smoke enters the alarm, this absorbs the particles, the current reduces, and the alarm sounds.

Radiation therapy cancer cells in a patient can be killed by careful use of x-ray
Thickness control the thickness of the paper can be controlled by measuring how much beta radiation passes through the paper to a Geiger counter.
Remote controlsInfrared radiation (IR) remote controls allow you to turn your TV, DVD, and home appliances on and off without being in the room with them. They. IR remotes have light-emitting diodes (LED) that transmit infrared