Edexcel A-Level Physics AS 2.3.39 Wavefronts Coherence and Interference Questions

Practise Edexcel IAL Physics 2.3.39 by defining coherence and explaining constructive or destructive interference using phase and path difference.

Exam points

define coherence as a constant phase relationship, usually with the same frequency
explain constructive or destructive interference using phase and path difference

[Maximum number: 3]

A student investigated the reflection of microwaves from a metal plate and a glass plate. The metal plate reflects microwaves and the glass plate partially reflects microwaves.

A plan view of the apparatus is shown.

The metal plate, the transmitter and the receiver were kept in fixed positions. The value of d was varied by moving the glass plate.

Figure for Question Edexcel A-Level Physics AS 2.3.39 Wavefronts Coherence and Interference Questions question 1 — Edexcel A-Level Physics AS

As d varied, the intensity of the microwaves detected by the receiver varied.

Explain why.

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Edexcel A-Level Physics AS 2.3.39 Wavefronts Coherence and Interference Questions question 1