a. Explain what is meant by destructive interference.
b. A student sets up an experiment to investigate the interference pattern formed by microwaves of wavelength 1.5 cm. The apparatus is set up as in Figure 13.17.The distance between the centres of the two slits is 12.5 cm. The detector is centrally placed 1.2 m from the metal plates where it detects a maximum. The student moves the detector 450 cm across the bench parallel to the plates.
Calculate how many maxima the detector will be moved through.
c. Calculate the frequency of these microwaves.

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microwave probe meter metal microwave sheets transmitter