Physics Past Questions and Answers

The resonant frequency of an a.c circuit is 1000 kHz. If each of the capacitance and inductance in the circuit is reduced by 50%, and no other changes are made, the resonant frequency will become

Eddy currents can be reduced by

an electron moves with a speed of 2.0 x 10⁶ms^-1 in a straight line. Calculate the wave length of the electron wave. [mass of an electron = 9.1 x 10^-31 kg][Planck's constant = 6.6 x 10^-34Js]

Oxidation of the filament in a light bulb is prevented by the introduction of

In a cathode ray tube, the function of the x-plates is to