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Physics 3
Question 14
3.1 Medical applications of physics

The diagram shows the basic structure of an eye.





(a) Light entering the eye is refracted by the eye lens.
(i) What happens to light rays that are refracted? (1 mark)
(ii) For a person with perfect vision, where in the…

Page 2

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Question 15
3.1 Medical applications of physics

(a) Ultrasound is a sound wave with a frequency above the upper limit of human
hearing. What is the maximum frequency that a person can hear? (1 mark)
(b) What type of wave are Xrays? (1 mark)
(c) Both Xrays and ultrasound are…

Page 3

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Question 16
3.1 Medical applications of physics

A student investigates the refraction of light as it passes out from a glass block into
the air.






Each time the student changes the angle of incidence (i) in the glass block he
measures the angle of refraction (r) in the air. The…

Page 4

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Question 17
3.1 Medical applications of physics

(a) The diagram shows an object 3 cm in front of a converging lens of focal length
6 cm.





(i) Complete a ray diagram to show the position of the image. (4 marks)
(ii) How can you tell from the completed ray diagram…

Page 5

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Question 18
3.2 Using physics to make things work

The diagram shows a mobile crane. The tower is raised and lowered hydraulically.





(a) What two properties of a liquid are used by a hydraulic machine? (2 marks)
(b) The clockwise moment about point P, caused by the weight W, is…

Page 6

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Question 19
3.2 Using physics to make things work

(a) The diagram shows a simple pendulum at one point in an oscillation (swing).





(i) Draw a cross ( ) on the diagram so that the centre of the cross marks the
position of the centre of mass of the pendulum…

Page 7

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Question 20
3.3 Keeping things moving

Diagram 1 shows a thin strip of aluminium foil held between the poles of a strong
magnet.




Diagram 1
(a) When the switch is closed the aluminium foil moves. Explain why. (3 marks)
(b) The direction in which the wire moves can be predicted…

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(c) Diagram 3 shows the crosssection through a loudspeaker.
Diagram 3
Explain how the alternating current input from the amplifier causes the
loudspeaker cone to vibrate. (5 marks)





8
© Steve Witney 2011
Philip Allan Updates

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Answer 14
(a) (i) The light rays change direction.
Change
dir
ect
ion
is
suf
fi
ci
ent
f
or
the
mar
k
(ii) At the retina
Remember
t
hat
t
he
ret
ina
is
w her
e t
he
image
in
the
eye
is
for
med
.
(iii) To…

Page 10

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Answer 15
(a) 20 000 Hz
Al
though
thi
s quest
ion
onl
y asked
for
t
he upper
l
imit
of
human hear
ing
you
need
t
o r
eme mber
that
t
he
compl
e t
e r
ange goes
fr
om 2 0
H z
to
20…

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