WAEC Past Questions and Answers - Page 3453

If the air inside a rigid box is heated, the

i. average speed of the molecules increases
ii. pressure of the air increases
iii. average separation of the molecule increases.

Which of the statements above are correct?

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 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

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

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