IB Physics HL C 3 14 Hl Diffraction Gratings Questions

Practise IB Physics HL C.3.14 by solving diffraction-grating order, angle, spectrum and multi-slit intensity problems.

Exam points

Apply nλ = d sinθ to determine diffraction-grating orders and angular positions.
Predict how wavelength, slit spacing and line density change the principal maxima.
Interpret multi-slit intensity patterns and explain the effect of increasing the number of illuminated slits.

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Study C.3.14 (HL)—Diffraction gratings conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Two sources of light produce an interference pattern on a screen.

Determine the largest order of the diffraction pattern in which all the wavelengths in the incident beam are present.

Considers the largest wavelength $\boldsymbol{O} \boldsymbol{R} \quad \theta=90^{\circ}$ $d \sin \theta=n \lambda \Rightarrow n=\frac{10^{-3}}{580} \frac{\sin 90^{\circ}}{650 \times 10^{-9}}=2.65$

So the second order/ n=2

Award [2] if smallest wavelength
used and an answer of n=3.

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IB Physics HL C 3 14 Hl Diffraction Gratings Questions question 1