physics general

Question 1

Infrared Radiation

Answer 1

Infrared radiation is the transfer of energy from one place to another by an electromagnetic wave.

Question 2

All objects emit and absorb ……

Answer 2

infrared radiation. The hotter an object is the more energy it radiates per second.

Question 3

what can infrared do

Answer 3

Infrared radiation can travel through a vacuum.

Question 4

what happens when infrared hits an object

Answer 4

When infrared radiation hits an object some of the energy is absorbed, making the objects temperature increase, and some is reflected.

Question 5

dark matt

Answer 5

Dark, matt surfaces are good absorbers and emitters of infrared radiation.

Question 6

light shiny

Answer 6

surfaces are poor absorbers and emitters of infrared radiation. An example of this is the silvering inside a vacuum flask.

Question 7

Uses of infrared radiation.

Answer 7

infrared heaters give out infrared radiation to heat a room

PIR’s (passive infra red devices), these can be found as part of home security alarm systems

thermal imaging cameras, police helicopters use these cameras to help find people when flying at night