Flashcards in Topic 4 & 5 Waves, light and the EM Spectrum Deck (76):
1 Name three different types of wave.
any three from: light, sound, waves on water, seismic waves
2 What property of a wave does the wavelength describe?
the distance from one wave to the same place on the next wave
3 What are the units for wavelength?
4 What property of a wave does the frequency describe?
the number of waves per second
5 What are the units for frequency?
6 What is transferred by a wave?
7 What does amplitude mean?
the height of a wave, more correctly, the maximum displacement of a particle from its rest position
8 In which direction do the particles in a sound wave move compared to the direction the wave is travelling?
backwards and forwards in the same direction as the wave
9 What word is used to describe waves like sound waves?
10 What word is used to describe waves like the waves on water?
11 Name a type of transverse wave.
waves on water, some seismic waves, light waves
12 Name a type of longitudinal wave.
sound, some seismic waves
13 What is the difference between longitudinal and transverse waves?
the direction the particles move compared to the direction the wave is travelling
14 What word describes the number of waves per second?
15 What word describes the time taken for one wave to pass?
16 What word describes the distance between a point on one wave and the same point on the next wave?
17 What are the units for frequency?
18 Name two things that waves can transfer.
energy and information
19 Name one thing that waves do not transfer.
20 What is the equation that links wave speed, frequency and wavelength?
wave speed=frequency x wavelength
21 What two things do you need to measure to find the speed of a wave?
either the time to cover a certain distance, or the wavelength and the frequency
22 Describe the path of light when you watch TV.
TV to eye
23 Describe the path of light when you sit underneath a lamp and read a book.
lamp to book to eye
24 What is the word that describes light bouncing off a material?
25 What does refraction mean?
changing the direction of a wave
26 When does refraction happen to light waves?
when light goes into or out of a material
27 Name three materials that light can travel through.
any three transparent materials, such as air, glass, water, Perspex
28 Why is it difficult to see the exact positions of objects on the bottom of a swimming pool?
light is refracted as it leaves the water
29 What does the frequency of a wave describe?
number of waves per second
30 What are the units for frequency?
31 What does the wavelength of a wave describe?
distance from one point on a wave to the same point on next wave
32 What are the standard units for wavelength?
33 What does refraction mean?
waves changing direction when they go from one material to another
34 What is a vacuum?
35 What materials can light pass through?
vacuum, air, glass, water
36 Are light waves transverse or longitudinal?
37 What do all waves transfer?
38 A nanometre is one millionth of a millimetre. Why are nanometres sometimes used for giving the wavelengths of light waves?
the wavelength is very short
39 What are the colours of the rainbow?
red, orange, yellow, green, blue, indigo, violet
40 What piece of apparatus can you use to split up light to form a spectrum?
41 Which colour in visible light has the longest wavelength?
42 What does EM stand for?
43 Are EM waves transverse or longitudinal?
44 Which part of our bodies detects visible light?
45 Which part of our bodies detects infrared?
46 H Name two parts of the EM spectrum that can travel through the atmosphere.
All can to some extent, but the expected answer at this stage is infrared and visible light, as we can detect both of these from the Sun .
47 Which electromagnetic waves have the highest frequency?
48 Which electromagnetic waves have the longest wavelengths?
49 Which electromagnetic waves have lower frequencies than visible light?
infrared, microwaves, radio waves
50 Which electromagnetic waves have higher frequencies than visible light?
ultraviolet, X-rays, gamma rays
51 Which colour of visible light has the shortest wavelength?
52 Which colour of visible light has the highest frequency?
53 Which colour of visible light has the lowest frequency?
54 Which part or parts of the electromagnetic spectrum is used for cooking?
infrared, microwaves, radio waves
55 Which part or parts of the electromagnetic spectrum is used for sending TV programmes?
radio waves, microwaves
56 Which part of the electromagnetic spectrum is used in TV remote controls?
57 Which part of the electromagnetic spectrum is detected by our eyes?
58 Which part of the electromagnetic spectrum is emitted by toasters and grills?
59 Which part of the electromagnetic spectrum is used for mobile phone communications?
60 Which part of the electromagnetic spectrum are light bulbs designed to emit?
61 Which part of the electromagnetic spectrum is used to cook food from the inside?
62 Which part of the electromagnetic spectrum is used to treat cancer?
63 Which part of the electromagnetic spectrum can be used to look inside bodies?
64 H How are radio waves produced?
by oscillations in electrical circuits
65 H How are radio waves detected?
They produce oscillations in circuits attached to an aerial.
66 H Why do radio waves sometimes have a longer range than microwaves?
refraction in the atmosphere
67 Which transfers the most energy: red, green or violet light?
68 Which part of the electromagnetic spectrum is used to sterilise surgical instruments?
69 Which part of the electromagnetic spectrum is used to examine luggage in airports?
70 Which part of the electromagnetic spectrum is used to sterilise water?
71 Which part of the electromagnetic spectrum do fluorescent materials emit?
72 Which part of the electromagnetic spectrum is produced inside many low energy light bulbs?
73 Which part of the electromagnetic spectrum is emitted by radioactive materials?
74 Which part of the electromagnetic spectrum is used to make images of bones?
75 Which part of the electromagnetic spectrum can cause skin cancer?