DP Physics (first assessment 2025)

Question 19M.1B.SL.TZ2.a

Date	May 2019	Marks available	[Maximum mark: 2]	Reference code	19M.1B.SL.TZ2.a
Level	SL	Paper	1B	Time zone	TZ2
Command term	Determine	Question number	a	Adapted from	N/A

[Maximum mark: 2]

19M.1B.SL.TZ2.a

When d = 0.200 mm, s = 0.9 mm and D = 280 mm, determine the percentage uncertainty in the wavelength.

[2]

Markscheme

Evidence of $\frac{{\Delta s}}{s}{\text{AND}}\frac{{\Delta D}}{D}$ used ✔

«add fractional/% uncertainties»

obtains 11 % (or 0.11) OR 10 % (or 0.1) ✔

Examiners report

A very easy question about percentage uncertainty which most candidates got completely correct. Many candidates gave the uncertainty to 4 significant figures or more. The process used to obtain the final answer was often difficult to follow.

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Question 19M.1B.SL.TZ2.a

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