(a) Microwave is the part of the electromagnetic spectrum wavelengths ranging from one meter to one millimeter which is suitable for radar system used in aircraft navigation.
(b) X-rays with wavelengths ranging from 0.01 to 10 nanometers are produced by bombarding a metal target by high speed electrons.
(iv) When a capacitor is charged or discharged there is a flow of charges from the battery to the plates of the capacitor. This produces a conduction current in the circuit and which causes a momentary deflection in the galvanometer.
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