Physics · Oct / Nov 2022 · Paper 41 · Question 5
0625
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The question as text
Fig. 5.1 shows a heater in a bathroom. heater Fig. 5.1 The heater is at a very high temperature and it glows red. The manufacturer states: “The heater emits light and radiation and it transfers thermal energy by radiation.”
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5(a)[1]
infrared
5(b)(i)[1]
(both) transverse / electromagnetic / travel in a vacuum / have the same (high) speed (in a vacuum)
5(b)(ii)[1]
(it / visible light) compared with an e.m. radiation stated by candidate in 5(a) in terms of frequency / wavelength
5(c)(i)[3]
equipment
e.g.
black container, white container, thermometers
or
Leslie’s cube and detector
measurements made
warm / hot water in container and temperature decreases recorded or time to reach a given temperature / to cool or
warm / hot water in cube and meter readings recorded
how a conclusion is reached
better emitter surface cools quicker
or
greater reading from better emitter surface
5(c)(ii)[2]
any two appropriate quantities
e.g.
initial temperature of water
mass / volume of water
dimensions / surface area of container
time of cooling
mass of container
shape of container
smoothness of surface
or
surface area of face (of cube)
distance of detector
temperature of water at time
of measurement
smoothness of surface
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