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Area 2: Particles and Waves

Quick questions on Interference and diffraction: coherence and the grating equation - SQA Higher Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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State the path-difference condition for constructive interference. [1 mark]
What is q2?
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A grating has 400400 lines per millimetre. Calculate its slit spacing. [2 marks]
What is q3?
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Light of wavelength 6.0×10−7 m6.0 \times 10^{-7}\ \text{m} passes through a grating with d=3.0×10−6 md = 3.0 \times 10^{-6}\ \text{m}. Calculate the angle to the first-order maximum. [3 marks]

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