DP Physics (first assessment 2025)

Question 23M.2.HL.TZ1.3cii

ii.

[Maximum mark: 2]

23M.2.HL.TZ1.3cii

(ii)

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

Use 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