Q7 · 2023 · Paper 2Simple familiar5 marks
QUESTION 7 (5 marks)
Discuss the nature of light by describing evidence from two key experiments.
WORKED SOLUTION
5 marksQCAA guide · typeset solution
ANSWER
See worked solution below.
Worked solution
Sample response The
Young's double slit experiment and black-body radiation both id
provide evidence for the behaviour of light. fre
In Young's double slit experiment, the interference patterns -
formed as light passed between the two slits demonstrates the -
wave nature of light. • de
In contrast, black-body radiation demonstrates the quantised 1
nature of light as electrons can only absorb or emit energy in ° de
discrete amounts.
Therefore, light has some wave properties and some particle ° «
properties.
he response:
e identifies evidence for the nature of light comes
from
— Young's double slit experiment [1 mark]
— black-body radiation [1 mark]
e describes evidence for wave nature of light
[1 mark]
• describes evidence for photons [1 mark]
e concludes light has the properties of both
waves and particles [1 mark]
One QCAA sample method typeset for web; criterion wording is adapted from the official marking guide.
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