CP5c Using The Long Wavelengths

Question 1

Uses of visible light

Answer 1

To see

Light bulbs emit visible light

Cameras detect visible light

Question 2

Uses of Infrared Radiation

Answer 2

Communication at short ranges; e.g TV and it’s remote control unit. The information is sent through optical fibres

A toaster transfers energy to food using infrared radiation

Security system sensors

Question 3

Uses of microwaves

Answer 3

Communications and satellite transmissions (phone signals)

In a microwave oven; waves transfer energy to the food heating up from the inside

Question 4

Uses of radio waves

Answer 4

Transmitting radio broadcasts and TV programmes

Controllers on the ground communicate with spacecraft using radio waves

Question 5

Radio waves are produced by…

Answer 5

oscillations (variations in current and voltage) in electrical circuits

Question 6

Oscillations

Answer 6

Movement backwards and forwards

Question 7

An aerial is used to recieve…

Answer 7

radio waves

Question 8

Radio waves are absorbed by the metal (aerial) and cause oscillations in…

Answer 8

electric circuits connetced to the aerial

Question 9

All microwaves pass through the

Answer 9

ionsophere

Question 10

If radio waves reach the ionsosphere at a suitable angle…

Answer 10

they may be refracted enough to send them back towards Earth