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Wave Phenomena · Paper 2 — Free Physics HL Practice Questions

1FoundationSAQ-SReflection, refraction, diffraction, and interference5 marksPaper 2~8 min
Two coherent sources of microwaves are placed d=3.0 cmd = 3.0 \text{ cm} apart and emit waves of wavelength λ=1.5 cm\lambda = 1.5 \text{ cm}. A detector is moved along a line far from the sources, perpendicular to the line joining them.
(a)
State the condition on path difference for constructive interference to occur at a point on the detector line, and explain why this condition produces constructive interference. [2 marks]
(b)
Calculate the angle θ\theta from the central maximum to the first-order maximum. Useful relation: dsin⁡θ=mλd \sin\theta = m\lambda [3 marks]
diagram

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