Question 23
Question 23 of 40
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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
7. Waves
7.1. Progressive waves

recall and use intensity = power/area and intensity ∝ (amplitude)² for a progressive wave

7. Waves
7.5. Polarisation

recall and use Malus’s law (I = I0 cos² θ) to calculate the intensity of a plane-polarised electromagnetic wave after transmission through a polarising filter or a series of polarising filters (calculation of the effect of a polarising filter on the intensity of an unpolarised wave is not required)

22. Quantum physics
22.2. Photoelectric effect

explain why the maximum kinetic energy of photoelectrons is independent of intensity, whereas the photoelectric current is proportional to intensity