Design an ac bridge like that seen previously to convert the capacity change of given Example into an ac offset voltage. The bridge should null at 0 m of level. Use R1 = R3 = 1 kΩ, C3 = 0.02 μF and an excitation of 5 V rms at 1 kHz. Plot the voltage versus level.
Example
A microwave source emits a pulse of radiation at 1 GHz with a total energy of 1 J. Find (a) the energy per photon and (b) the number of photons in the pulse.