Physics Past Questions and Answers

If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆P_a is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is

If the frequency of an emitted x-ray is 1.6 x 10¹⁶Hz, the accelerating potential is?
[e = 1.6 x 10^-19C, h = 6.63 x 10^-34Js]

If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?

A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are