12
7 (a) Ultraviolet radiation is one component of the electromagnetic spectrum.
(i) State the name of two components of the electromagnetic spectrum that have a smaller
wavelength than ultraviolet radiation.
1 ........................................................................................................................................
2 ........................................................................................................................................
[1]
(ii) State one useful application of ultraviolet radiation.
..................................................................................................................................... [1]
(iii) Exposure to ultraviolet radiation from the Sun damages the eyes.
State one type of damage to the eye caused by ultraviolet radiation.
..................................................................................................................................... [1]
(b) Fig. 7.1 shows a ray of light. The ray passes into a semi-circular block of glass at A and
leaves the glass at B, travelling along the surface to C.
B C
40°
A
Fig. 7.1
(i) State the name given to the angle of incidence marked as 40°.
..................................................................................................................................... [1]
(ii) Calculate the refractive index of the glass.
refractive index = ......................................................... [2]
[Total: 6]
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8
, ,
4 A student directs a beam of white light from a filament lamp towards a glass prism in a dark room.
Fig. 4.1 shows the beam of white light incident on the left-hand side of the glass prism.
glass prism
screen
beam of
white light P
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air
V
Fig. 4.1
A screen is placed to the right of the glass prism. Red light is observed at point R on the screen
and violet light is observed at point V.
(a) Draw on Fig. 4.1 to show the paths of the red light and the violet light between the left-hand
side of the prism and the screen at point R and point V. [2]
(b) State what these observations show about the change in speed of red light and change in
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speed of violet light as each enters the glass from the air.
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
(c) Five other colours of light appear on the screen between the red light at point R and the violet
light at point V.
(i) State the names of the five colours and list them in the correct order from red to violet.
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red ..................................................................................................................... violet [2]
(ii) State how the frequency and the wavelength of the coloured light change going from
red light to violet light.
frequency ..........................................................................................................................
wavelength ........................................................................................................................
[1]
(d) On Fig. 4.1, point P is shown immediately next to point R.
No light is observed at point P, but a detector at point P registers radiation reaching the
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detector.
State which region of the electromagnetic spectrum is detected at point P.
............................................................................................................................................. [1]
[Total: 8]
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5054/21/O/N/24
8
4 (a) Fig. 4.1 shows light passing through a triangular glass prism.
Q R
Fig. 4.1
(i) State the value of the angle of incidence at point P.
angle of incidence = ....................................................... ° [1]
(ii) Draw the normal and the angle of incidence at point R.
Label the angle of incidence. [2]
(iii) State two conditions needed so that no light refracts from the glass into the air at point Q.
1 ........................................................................................................................................
...........................................................................................................................................
2 ........................................................................................................................................
...........................................................................................................................................
[2]
(b) Information is sent across the internet using pulses of visible light through long, thin glass
fibres and electrical signals through copper wires.
(i) State the name of one other type of electromagnetic radiation used to transmit information
through long, thin glass fibres.
..................................................................................................................................... [1]
(ii) Suggest two advantages of using glass fibres rather than copper wires to transmit
information from the internet.
1 ........................................................................................................................................
...........................................................................................................................................
2 ........................................................................................................................................
...........................................................................................................................................
[2]
[Total: 8]
© UCLES 2024 5054/22/M/J/24
