Radiation and treatment

Question 1

What are x-rays used for?

Answer 1

Medical imaging

Question 2

What do CAT scans use?

Answer 2

X-Rays

Question 3

What do endoscopes use to look inside the body?

Answer 3

Optical fibres

Question 4

What is ultrasound?

Answer 4

A sound with a higher frequency than we can hear

Question 5

What are two uses of ultrasound?

Answer 5

1. Breaking down kidney stones

2. Pre-natal scanning of the foetus

Question 6

Fill in the gap:

Intensity of radiation depends on _______ from source

Answer 6

1. Distance

Question 7

What other thing does the intensity of radiation depend on?

Answer 7

The medium that it is passing through

Question 8

Fill in the gap:

Refraction is a change in _________ caused by a change in ______

Answer 8

1. Direction

2. Speed

Question 9

Fill in the gap:

A powerful lens has a ____ focal length

Answer 9

1. Short

Question 10

What is the iris?

Answer 10

The coloured part of the eye

Question 11

What’s the pupil?

Answer 11

The hole in the middle of the eye

Question 12

What’s its role?

Answer 12

To control the amount of light entering the eye

Question 13

Fill in the gap:

Short-sighted people cant focus on ____ objects

Answer 13

1. Distant

Question 14

Fill in the gap:

Long-sighted people cant focus on ___ objects

Answer 14

2.Near

Question 15

What can short-sightedness be corrected with?

Answer 15

1. Diverging lenses

Question 16

What can long-sightedness be corrected with?

Answer 16

2. Converging lenses

Question 17

What else can be used to correct vision defects?

Answer 17

Laser eye surgery

Question 18

Fill in the gap:

Every transparent material has a _________ index

Answer 18

1. Refractive

Question 19

What is Total Internal Reflection(TIR) dependent on?

Answer 19

The angle of incidence

Question 20

State two uses of optical fibres

Answer 20

1. Medical diagnosis

2. Communications technology