The student finds that the signal at the receiver R falls from max to zero when R is moved 0.75 cm towards a transmitter. Explain this observation. Make it clear how signal can be zero and why the distance moved is 0.75 cm.
The waves interfere. This produces a stationary wave with nodes and antinodes. The resultant signal is zero at a node. Distance from the max (antinode) to zero (node) is wavelength/4 which is 0.75 cm. 4 marks
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