Radiation and treatment Flashcards Preview

Physics 3 > Radiation and treatment > Flashcards

Flashcards in Radiation and treatment Deck (20):
1

What are x-rays used for?

Medical imaging

2

What do CAT scans use?

X-Rays

3

What do endoscopes use to look inside the body?

Optical fibres

4

What is ultrasound?

A sound with a higher frequency than we can hear

5

What are two uses of ultrasound?

1. Breaking down kidney stones
2. Pre-natal scanning of the foetus

6

Fill in the gap:
Intensity of radiation depends on _______ from source

1. Distance

7

What other thing does the intensity of radiation depend on?

The medium that it is passing through

8

Fill in the gap:
Refraction is a change in _________ caused by a change in ______

1.Direction
2.Speed

9

Fill in the gap:
A powerful lens has a ____ focal length

1. Short

10

What is the iris?

The coloured part of the eye

11

What's the pupil?

The hole in the middle of the eye

12

What's its role?

To control the amount of light entering the eye

13

Fill in the gap:
Short-sighted people cant focus on ____ objects

1. Distant

14

Fill in the gap:
Long-sighted people cant focus on ___ objects

2.Near

15

What can short-sightedness be corrected with?

1. Diverging lenses

16

What can long-sightedness be corrected with?

2. Converging lenses

17

What else can be used to correct vision defects?

Laser eye surgery

18

Fill in the gap:
Every transparent material has a _________ index

1. Refractive

19

What is Total Internal Reflection(TIR) dependent on?

The angle of incidence

20

State two uses of optical fibres

1.Medical diagnosis
2. Communications technology