1
Q

What speed do all waves in the electromagnetic spectrum travel at?

A

All waves in the electromagnetic spectrum travel at the speed of light - 3 x 108 ms-1.

2
Q

Give one application of radio waves.

A
• Satellite transmissions
• Communications
3
Q

Name an example of a longitudinal wave.

A

Sound waves are longitudinal waves.

4
Q

What is meant by the wavelength of a wave?

A

Wavelength is the distance between a point on one wave and the same point on the next wave.

5
Q

Name the three quantities shown in this formula.

A

d = distance

v = speed

t = time

6
Q

Give one use of gamma rays.

A
• sterilising food and medical equipment
• treating cancer
• medical tracers
7
Q

Name the seven different types of waves in the electromagnetic spectrum.

Try to list them from long λ (wavelength) to short λ.

A

Microwaves

Infrared

Visible

Ultraviolet

X-rays

Gamma rays (short λ)

8
Q

What is the unit for speed?

A

The unit for speed is metres per second (ms-1)

9
Q

What is meant by the period of a wave?

A

The period of a wave is the time taken for one wave to pass.

10
Q

How is the frequency of a wave in the e.m. spectrum related to its energy?

A

The higher the frequency of a wave in the e.m. spectrum, the more energy the wave has.

11
Q

Give one use of visible light.

A
• photography
• illumination
• street lighting
12
Q

Give one application of microwaves.

A
• cooking
• mobile phone communications
13
Q

What is the unit for distance?

A

The unit for distance is metres (m)

14
Q

Name the three quantities shown in this formula.

A

v = speed

f = frequency

λ = wavelength

(λ is called ‘lambda’)

15
Q

What is the unit for time?

A

The unit for time is seconds (s)

16
Q

What is meant by the statement “A frequency of 16 Hz” ?

A

This means that there are

16 waves per second.

17
Q

What type of wave are microwaves an example of?

A

Microwaves are an example of transverse waves.

18
Q

Complete the following sentence:

All waves carry ……………

A

All waves carry energy.

19
Q

What type of wave is a sound wave an example of?

A

A sound wave is an example of a longitudinal wave.

20
Q

Which wave in the electromagnetic spectrum has the longest wavelength?

A

Radio waves have the longest wavelength.

21
Q

State one source of visible light.

A

Sources of visible light include:

• the Sun
• light bulbs
• anything hot enough to glow

22
Q

What is the unit for frequency?

A

The unit for frequency is hertz (Hz)

23
Q

State a detector of infrared radiation.

A
• photodiode
• phototransistor
• thermistor
• thermocouple
24
Q

Which wave in the electromagnetic spectrum has the greatest energy?

A

Gamma rays have the greatest energy.

25
Q

What is meant by the amplitude of a wave?

A

The amplitude of a wave is the height of the wave.

(from middle to top)

26
Q

Give one use of infrared.

A
• thermal imaging
• remote controls
• security systems
27
Q

What type of wave is a water wave an example of?

A

A water wave is an example of a transverse wave.

28
Q

From the diagram shown, identify the wavelength of the wave.

A

C is the wavelength.

29
Q

Give one use of X-rays.

A
• medical X-ray scans
• airport security scanners
30
Q

What is the unit for wavelength?

A

The unit for wavelength is metres (m)

31
Q

Which wave in the electromagnetic spectrum has the least energy?

A

Radio waves have the least energy.

32
Q

From the diagram shown, identify the amplitude of the wave.

A

D is the amplitude.

33
Q

Which wave in the electromagnetic spectrum has the shortest wavelength?

A

Gamma rays have the shortest wavelength.

34
Q

Give one use of ultraviolet.

A
• security marking
• detecting forged bank notes
• fluorescent lamps
35
Q

What is the unit for amplitude?

A

The unit for amplitude is metres, m.

36
Q

What do all waves in the electromagnetic spectrum have in common?

A

All waves in the electromagnetic spectrum travel at the same speed (the speed of light).

37
Q

Describe what is meant by gamma radiation.

A
• Gamma radiation is a wave in the electromagnetic spectrum
• Gamma rays have no mass or charge
• Gamma rays have a very short wavelength and a high frequency
38
Q

State a detector of radio waves.

A

An aerial is used to detect radio waves.

39
Q

What is meant by the frequency of a wave?

A

Frequency is the number of waves per second.

40
Q

What is the unit for period?

(period of a wave)

A

The unit for period is seconds (s)