Physics Past Questions and Answers

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms\(^{-1}\), how far is he from the cliff?

Which of the following is not a vector quantity?

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively.

What is the voltage across the capacitor?

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?

[e = 1.6 x 10\(^{-19}\)J, h = 6.63 x 10-\(^{34}\)Js]