(i) Harmonics are integer multiples of the fundamental or input frequency. (ii) Harmonics of 60 Hz are 60Hz (fundamental), 120 Hz, 180 Hz, 300 Hz, 420 Hz… (iii) Total Harmonic Distortion (THD) is the ratio of square root of the sum of the squares of individual rms harmonic voltages to the rms value of the fundamental and is given by

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.