Solutions to KU Revision Questions for Dynamics & Space Unit ...
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(continued). (d) In an experiment to investigate mobile phone signals, a student sets up ... The mobile phone transmits
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Solutions to KU Revision Questions for Dynamics & Space Unit ...
On your diagram mark where the aerial should be positioned to get the strongest signal. (iii) On the blank oscilloscope
National 4 Physics
Solutions to KU Revision Questions for Dynamics & Space Unit Assessment
mrmackenzie.co.uk
DO NOT WRITE IN THIS MARGIN
21.
(continued)
Marks
(d) In an experiment to investigate mobile phone signals, a student sets up the following equipment. The mobile phone transmits signals as pulses. curved reflector
mobile phone
oscilloscope
aerial
(i) Why is there a curved reflector behind the aerial? to make the signal stronger OR to direct the signals to the aerial
1
(ii) Complete the diagram below to show how the curved reflector affects the signals. On your diagram mark where the aerial should be positioned to get the strongest signal.
beams reflect and come to focus (1) position of aerial (1) AERIAL
2 (iii) On the blank oscilloscope grid below, draw the signal that you would expect to see if the curved reflector was removed.
same frequency (1) any smaller amplitude (1)
Signal received when a curved reflector is used.
Signal received with curved reflector removed. Page 5
2
SECTION B Marks 21.
A satellite dish is used to detect TV signals. (a)
Complete the sentences below using some of these words. lower 200 million
higher stronger
TV signals have a
340 geostationary
frequency than radio signals.
higher (½)
TV signals travel at a speed of
300 million weaker
300 million (½)
A satellite dish is curved to make the received signal
metres per second. stronger (½)
.
A satellite that stays above the same point on the Earth’s surface is called a geostationary (½) (b)
satellite.
2
Complete the diagram to show the effect the satellite dish has on the TV signals received. 2
reflected rays (1) focus point (1)
(c)
(i)
If the curved dish is made larger, does the received signal strength increase, decrease or stay the same? increase
(ii)
1
Explain your answer. more energy (or signals) collected
