5.2.3 EM waves in healthcare

Question 1

How is infrared radiation used for imaging?

Answer 1

A thermal imaging camera produces a thermogram that shows regions of different temperatures.

Question 2

How are x rays used for imaging?

Answer 2

Bones absorb X rays but your soft tissues like ur skin and muscle do not.

Question 3

How are gamma rays used for imaging?

Answer 3

A doctor will inject a patient with a radioactive substance that emits gamma rays and the sensor will detect the gamma rays travelling out of the body.

Question 4

How to read ray diagrams

Answer 4

draw a line to represent the rays and then draw a normal at 90 degrees to the point the ray hits it and then measure the angles from the normal to the rays.

Question 5

Why are EM waves refracted

Answer 5

when they change speed. When light goes from air into glass at an angle it will slow down and bend towards the normal.