Waec Physics 2002 Past Questions and Answers

Question 46:

• WAEC 2002

In a model of the hydrogen atom, the energy levels W_n are given by the formula W_n = -\(\frac{R}{n^2}\), where n is an integer and R is a constant. Determine the energy released in the transition from n = 3 to n = 2.

A. \(\frac{R}{5}\)
B. -\(\frac{R}{4}\)
C. \(\frac{5R}{36}\)
D. \(\frac{-5R}{36}\)

Question 47:

• WAEC 2002

If a radioactive atom emits a beta particle, Its mass number

A. Increases by one
B. Remains the same
C. Decreases by one
D. Increases by two

Question 48:

• WAEC 2002

Which of the following is usually used to cause fission in an atomic reactor?

A. Alpha particles
B. Beta particles
C. Electrons
D. Neutrons

Question 49:

• WAEC 2002

Which of the following materials is used to control the rate of neutron production in a nuclear reactor?

A. Boron rods
B. Concrete shield
C. Graphite rods
D. Uranium rods