Question
Two coherent progressive waves from different sources meet at a point.
Which condition must be satisfied for there to be zero resultant amplitude at the point where the waves meet?
A The two waves must be emitted from their sources with the same intensity.
B The two waves must be in phase with each other at the point.
C The two waves must be travelling in opposite directions.
D The two waves must have the same amplitude at the point.
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Question
A source of sound of frequency F at point Z is moving at a steady speed. The pattern of the
emitted wavefronts is shown.
Which row describes the frequencies of the sound heard by stationary observers at X and Y?
Answer/Explanation
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Question
Answer/Explanation
Question
Which statement describes a situation when polarisation could not occur?
A Light waves are reflected.
B Light waves are scattered.
C Microwaves pass through a metal grid.
D Sound waves pass through a metal grid.
Answer/Explanation
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Question
Which statement about a light wave and a sound wave is correct?
A Both can be polarised.
B Both can travel through free space.
C Both have a frequency inversely proportional to their wavelength.
D Both have an intensity proportional to their amplitude.
Answer/Explanation
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