DP Physics (first assessment 2025)

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Question 22M.1A.SL.TZ1.1

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ1.1
Level SL Paper 1A Time zone TZ1
Command term Question number 1 Adapted from N/A
1.
[Maximum mark: 1]
22M.1A.SL.TZ1.1

The intensity of a wave can be defined as the energy per unit area per unit time. What is the unit of intensity expressed in fundamental SI units?

A.  kg m−2 s−1

B.  kg m2 s−3

C.  kg s−2

D.  kg s−3

[1]

Markscheme

D

Examiners report

The unit analysis in this question proved tricky for many HL candidates, with option A being the most common (incorrect) answer. The high discrimination index suggests that this question was more problematic for weaker candidates.

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