P12

Question 1

Which part of the electromagnetic spectrum can the human eye detect?

Answer 1

Visible light

Question 2

What is transferred by electromagnetic waves?

Answer 2

Energy

Question 3

What is the order of the electromagnetic spectrum in decreasing wavelength

Answer 3

Radio  Microwaves  Infrared  Visible Light  Ultraviolet  X Rays  Gamma Rays

Question 4

What is the speed of all electromagnetic waves?

Answer 4

300 million m/s (300 000 000)

Question 5

Write the equation that links: wave speed, frequency and wavelength

Answer 5

Wave speed = frequency x wavelength

Question 6

What colours does white light contain?

Answer 6

Red, orange, yellow, green , blue, indigo, violet

Question 7

Which objects emit the most infrared radiation?

Answer 7

Hotter objects

Question 8

What are some uses of infrared radiation?

Answer 8

Carrying signals in remote controls​

Optical fibres​

Medical scanners​

Cameras

Question 9

What are some uses of microwaves?

Answer 9

Satellite TV​

Mobile phone communications​

Microwave ovens

Question 10

What are some uses of radio waves?

Answer 10

Radio ​

TV signals​

Mobile phone communications​

Bluetooth

Question 11

What aRE SOME USES of UV waves?

Answer 11

Security marker pens​

Sunbeds

Question 12

What are the dangers of UV waves?

Answer 12

Damage eyes​

Damage skin​

Can lead to skin cancer

Question 13

What are some uses of X Rays?

Answer 13

Medical imaging​

Detect cracks in metal objects​

Destroy tumours

Question 14

What are some uses of Gamma Rays?

Answer 14

Killing harmful bacteria from food and surgical equipment​

Radiotherapy (cancer treatment)

Question 15

What is ionisation?

Answer 15

Atoms becoming charged when they lose or gain an electron

Question 16

What damage can ionisation do to cells?

Answer 16

Cause mutations and cancers

Question 17

How can you reduce the risk of ionisation?

Answer 17

Film exposure badge​

Reduce time exposed​

Mask and gloves

Question 18

What 3 things does the radiation dose depend on?

Answer 18

Type of radiation​

Length of exposure​

Energy per second absorbed by the body

Question 19

What is radiation dose measured in?

Answer 19

Sieverts (Sv) or Millisieverts (mSv

Question 20

What are carrier waves?

Answer 20

Waves that are used to carry information

Question 21

How can carrier waves be used to transfer information?

Answer 21

Vary amplitude

Question 22

How are X rays produced?

Answer 22

Electrons move at high speeds

Question 23

How are gamma rays produced?

Answer 23

By radioactive substances when unstable nuclei release energy

Question 24

Why are low energy x-rays suitable for imaging?

Answer 24

Absorbed by bones and teeth​

Pass through soft tissue