Q9 · 2021 · Paper 2Simple familiar3 marks
QUESTION 9 (3 marks)
Explain how Young’s double slit experiment provides evidence for the wave model of light.
WORKED SOLUTION
3 marksQCAA guide · typeset solution
ANSWER
See worked solution below.
Worked solution
Young’s double slit experiment consisted of light shining
through two thin slits. This produced light and dark spots on
a screen behind the slits, caused by constructive and
destructive interference of the light. This interference is a
behaviour seen in mechanical waves and provides
evidence for the wave nature of light.
• describes the results of Young’s double slit
experiment [1 mark]
• recognises that Young’s experiment involves
constructive and destructive interference [1 mark]
• states that the result is similar to that of a
mechanical wave [1 mark]
One QCAA sample method typeset for web; criterion wording is adapted from the official marking guide.
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