Chapter 6 - Waves

Question 1

What are the units of frequency?

Answer 1

Hertz (Hz)

Question 2

How could you describe frequency?

Answer 2

It is the number of waves passing a point per second

Question 3

How do you measure wavelength?

Answer 3

It is the distance from a point on a wave to the identical point on the next wave

Question 4

What are the 7 sections of the electromagnetic spectrum from longest to shortest wavelength?

Answer 4

Radio, Microwaves, Infra-red Radiation, Visible Light, U.V, X-Rays, Gamma Rays

Question 5

What equation links wave speed, distance and time?

Answer 5

Wave speed = distance / time

v = d/t

Question 6

What equation links wave speed, frequency and wavelength?

Answer 6

Wave speed = frequency x wavelength

v = f x λ

Question 7

Name some uses of radiowaves

Answer 7

Transmitting radio/T.V signals

Walkie talkies

Question 8

Name some uses of microwaves

Answer 8

Heating food in microwave ovens

Sending mobile phone signals/texts

Question 9

Name some uses of infra-red radiation

Answer 9

Heating food in toasters/grills
Night vision (Thermal imaging cameras)

Question 10

Name some uses of visible light

Answer 10

Cameras, optical microscopes

Question 11

Name some uses of U.V light

Answer 11

Tanning beds
Photosynthesis in plants
Producing vitamin D
Checking for forged notes