Electromagnetic spectrum

Question 1

All the types of electromagnetic radiation are ordered in terms of their wavelength/frequency

Answer 1

Electromagnetic spectrum

Question 2

Order of electromagnetic spectrum in increasing frequency.

Answer 2

Radiowaves, microwaves, infrared radiation, visible light, ultraviolet, x-rays, gamma rays

Question 3

Speed of electromagnetic radiation in a vacuum

Answer 3

3 x 10⁸ m s^-1

Question 4

State a use of radiowaves

Answer 4

Communications
Radio
TV
Any other correct use

Question 5

State a use of microwave radiation

Answer 5

Communications satellites
Telephony
Used to heat/cook food

Any other correct use

Question 6

State a use of infrared radiation

Answer 6

Detector in security lighting
Remote controls (e.g. TV)

Any other correct use

Question 7

State a use of visible light

Answer 7

Seeing
Photography
Communication (eg in optical fibres),
Laser surgery

Any other correct use

Question 8

State a use of ultraviolet radiation

Answer 8

Sun-tan lamp
Killing bacteria in water treatment plants

Any other correct use

Question 9

State a use of X-rays

Answer 9

Imaging for breaks/defects in bones
Hidden devices

Any other correct use

Question 10

State a use of gamma rays

Answer 10

Medical tracers
Killing cancerous cells
Sterilisation of surgical equipment

Any other correct use

Question 11

State one detector of radio waves and microwaves

Answer 11

Aerials

Question 12

State one detector of infrared radiation

Answer 12

Electronic detectors
Heat-sensitive papers
Black-bulb thermometer

Question 13

State one detector of visible light

Answer 13

Eye
Photographic film
Electronic components (eg LDR)

Question 14

State one detector of Ultraviolet radiation

Answer 14

Causes fluorescence (glowing) in some objects
Film

Question 15

State one detector of X-rays

Answer 15

Photographic film

Question 16

State one detector of Gamma rays

Answer 16

Photographic film
Geiger–Müller tube (GM tube)