P1 Revision cards
P1 Revision Questions
Part 2
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Question 1
• Name 3 ways that microwaves lose their signal in communications?
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Answer 1
• Signal is scattered, weather, interference, no diffraction
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Question 2
• How could you reduce the signal loss of microwaves?
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Answer 2
• Limiting the distance between transmitters, high positioning of transmitters
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Question 3
• Why is it important that scientists publish their results?
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Answer 3 .... of 50
So they can be repeated and tested-to see if it is correct
and develop the theory further
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Question 4
• Describe 2 uses of infrared radiation?
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Answer 4
• Fibre optics, remote controls
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Question 5
• How do thermal imaging cameras work?
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Answer 5 .... of 50
Detect infrared radiation given off
by objects- hot objects give off
more
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Question 6
• What is an analogue signal? What is a digital signal?
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Answer 6
• Analogue- signal that is continuously changing. Digital- Signal that is either on or off
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Question 7
• Name 2 advantages of digital signals
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Answer 7
• Interference can be removed easily, more information can be carried by multiplexing
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Question 8
• How can infrared waves be used to send a message?
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Answer 8
• Pulses of infrared waves are send and are read as binary code
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Question 9
• Why is it easier to remove noise from digital signals?
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Answer 9
• Because they can only have 2 values
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Question 10
• Give 2 properties of fibre optics
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Answer 10 .... of 50
Transmit signals very fast over long distances
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Question 11
• Give 3 uses of wireless technology
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Answer 11
• Radios, phones, laptops
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Question 12
• Name 3 advantages of wireless communication
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Answer 12
• Portable, convenient, access on the move, no direct connection needed (but aerial is
needed)
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Question 13
• What does a digital signal look like?
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Answer 13 .... of 50
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Question 14
• What happens to radio waves when sent up to the ionosphere?
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Answer 14
• They get reflected
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Question 15
• What happens to microwaves when they are sent up to the ionosphere?
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Answer 15
• They go through it and reach a satellite outside the atmosphere
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Question 16
• How does a microwave signal get from one place to another?
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Answer 16 .... of 50
Emitter by transmitter and received by satellite
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Question 17
• Name 2 advantages and 2 disadvantages of DAB radio
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Answer 17
• More radio stations, less interference, poorer audio quality, not all areas covered
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Question 18
• What factors can affect wave communication?
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Answer 18
• Weather conditions, frequency of waves
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Question 19
• How are earthquakes detected? What does this make?
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Answer 19
• Seismometer makes a seismograph
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Question 20
• Name 4 dangers of UV light
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Answer 20
• Cataracts, aging skin, skin cancer, skin burn
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Question 21
• What 3 types of waves do earthquakes make. Give 2 properties of each one
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Answer 21
• L waves- travel along surface.
• P waves- longitudinal, fastest waves, travel through liquids. S waves- transverse, travels
through solids
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Question 22
• Put the waves produced by an earthquake in order from fastest to slowest
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Answer 22
• P waves are fastest, s waves are slowest
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Question 23
• What is meant by a sun cream's SPF?
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Answer 23
• Sun protection factor- how many times longer you can spend in the sun with it on
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Question 24
• How does darker skin reduce skin cancer?
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Answer 24
• Skin absorbs more radiation so it does not reach and damage the cells
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Question 25
• How can we predict the Earth’s structure using seismic waves?
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Answer 25
• P waves can be detected the opposite side of the earth but S waves cannot- as S waves
cannot travel through liquids
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