Physics Past Questions and Answers

The wave phenomenon demonstrated in the diagram above is

The diagram above represents the graph of the force F applied in stretching a spiral spring against the corresponding extension (X). The force constant of the spring is

If a light wave has a wavelength of 500nm in air what is the frequency of the wave?<br/>[c = 3 x 10<sup style='font-size: smaller;'>8</sup> ms<sup style='font-size: smaller;'>-1</sup>]

Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible

From the diagram above, if the potential difference across the resistor, capacitor and inductor are 80 v, 110 v, 40 v respectively, the effective potential difference is