Physics Past Questions and Answers

An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level,calculate the energy at the third level.
[h = 6.6 x 10^-34Js; f = 10¹⁵Hz]

In the diagram above, which of the following velocity-time graphs shows uniform acceleration of a body from rest?

In the diagram above, the neutral point is at

From the diagram above, the measuring accuracy of the micrometer screw gauge is

In the diagram above, the direction of the force between N and S in the magnetic field is