the correct interpretation
Two coherent waves in a ambulance siren recording reach a point with path difference \(0.3\,\text{m}\). If \(\lambda=0.12\,\text{m}\), calculate the phase difference in radians. Enter the numerical result and choose the interpretation that matches the wave physics.
Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.