IB Physics HL C.3.14 Diffraction Gratings Question Bank

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

[Maximum number: 3]

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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C.3.14 (HL)—Diffraction gratings question 1