2007 - WAEC Physics Past Questions and Answers - page 5

Which of the following electromagnetic wave can be detected by its heating effect?

If a gas is excited by high voltage to produce a discharge and the light is examined in a spectrometer

The number of protons in an element increased by one after a radioactive decay. The element must have decay by emitting

In a nuclear reactor, chain reactions result from the release of

The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons

There is always an uncertainty involved in any attempt to measure the position and momentum of an electron simultaneously. This statement is known as the

The diagram above illustrates three forces acting on an object at point O. If the object is in equilibrium, determine the magnitude of the force P.

Calculate the effective resistance between P and Q in the diagram above