P5.2

Question 1

Spectrum

Answer 1

A continuous range of frequencies

Question 2

Electromagnetic spectrum

Answer 2

A group of waves forming a spectrum

Question 3

Visible light

Answer 3

Electromagnetic radiation which we can detect w/ our eyes.

This is because they are not absorbed by the atmosphere

Question 4

Order of EM spectrum

Answer 4

Radio waves
Micro waves
Infra red
Visible light
Ultraviolet
X ray
Gamma ray

Question 5

As you go towards Gamma in the em spectrum….

Answer 5

Frequency increases

Wavelength decreases

Question 6

As you go towards radio waves in the em spectrum…

Answer 6

Frequency decreases

Wavelength increses

Question 7

Speed of light

Answer 7

3.0 x 10 to the power of 8

Question 8

Can em waves travel though a vacuum

Answer 8

Yes because they are radiation and do not require a medium

Question 9

Use for microwaves

Answer 9

• microwaves

- wireless communication

Question 10

Use for radio waves

Answer 10

• television and radio signals

Question 11

Use for infrared

Answer 11

• remote controls use pulses of IR to communicate w/ TV

Question 12

Uses for UV

Answer 12

• helps to make vitamin D
• forensics (detects bodily fluids)
• detect forged bank notes
• kill bacteria in water

Question 13

Use for X ray

Answer 13

• kill cancer cells

Question 14

Use for gamma rays

Answer 14

• kill cancer cells and bacteria on food

Question 15

Thermal imaging camera

Answer 15

Camera w/ a film or sensory which detects infrared radiation

Question 16

Thermogram

Answer 16

Image produced by a thermal imaging camera showing different intensities of infrared radiation due to differing temperatures

Question 17

Charge-coupled device (CCD)

Answer 17

A device w/ pixels that detect em radiation (e.g. phone camera)

Question 18

Computerised tomography (CT scan)

Answer 18

Producing an image of inside the body using a series of x ray images

Question 19

How is gamma used for imaging

Answer 19

Used as a tracer. Helps treat problems .