DP Physics (first assessment 2025)

Question 23M.2.SL.TZ1.c

Date	May 2023	Marks available	[Maximum mark: 2]	Reference code	23M.2.SL.TZ1.c
Level	SL	Paper	2	Time zone	TZ1
Command term	Determine	Question number	c	Adapted from	N/A

[Maximum mark: 2]

23M.2.SL.TZ1.c

The graph shows the actual variation with displacement $x$ from M of the intensity of the light on the screen. $I_{0}$ is the intensity of light at the screen from one slit only.

The slits are separated by a distance of 0.18 mm and the distance to the screen is 2.2 m. Determine, in m, the wavelength of light.

[2]

Markscheme

Ue of s = $\frac{λ D}{d} \Rightarrow λ$ = $\frac{s d}{D}$ OR s = $\frac{n λ D}{d} \Rightarrow λ$ = $\frac{s d}{n D}$ ✓

$λ$ = « $\frac{0.567 \times 10^{- 2} \times 0.18 \times 10^{- 3}}{2.2}$ =» 4.6 × 10⁻⁷ «m» ✓

Syllabus sections

C. Wave behaviour » C.3 Wave phenomena

Question 23M.2.SL.TZ1.c

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