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QLDPhysicsQuick questions

Unit 2: Linear motion and waves

Quick questions on The wave equation v=fλv = f\lambda and applications (QCE Physics Unit 2)

6short 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 iA1 data test?
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Often a slinky or oscilloscope stimulus, with a measured period or frequency and a wavelength read off a diagram. Compute speed.
What is eA Paper 1?
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Standard multiple choice: which quantity changes when a wave crosses media (answer: speed and wavelength, not frequency).
What is eA Paper 2?
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Used as a setup for refraction calculations and standing-wave problems in Unit 4 quantum context (where photon wavelength sets ionising potential).
What is q1?
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State the wave equation and define each symbol. [2 marks]
What is q2?
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A sound wave of frequency 440 Hz440 \text{ Hz} moves from air (v=340 m s−1v = 340 \text{ m s}^{-1}) into water (v=1480 m s−1v = 1480 \text{ m s}^{-1}). Calculate the wavelength in each medium. [3 marks]
What is q3?
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An ultrasonic gauge at 5.0 MHz5.0 \text{ MHz} examines a Cairns light-rail track. (a) Calculate λ\lambda in steel (v=5900 m s−1v = 5900 \text{ m s}^{-1}). (b) Calculate λ\lambda in a 2400 m s−12400 \text{ m s}^{-1} polymer pad coupling.

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