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## WAEC: PHYSICS

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Lesson 1, Topic 1
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# Free WAEC Physics Theory Past Questions

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### Question 1 ( No. 12. 2022 Physics WAEC Theory Past Question)

(a)(i) What is meant by the term artificial radioactivity?

(ii) Complete the table below.

(b) In an x-ray tube, an electron is accelerated from rest towards a metal target by a 30 kV source. Calculate the kinetic energy of the electron. [e = 1.6 × 10-19 C]

(c) The table below shows the frequencies of radiations incident on a certain metal and the corresponding kinetic energies of the photoelectrons.

(i) Plot a graph of kinetic energy, K.E, on the vertical axis and frequency, f, on the horizontal axis starting both axes from the origin (0,0).

(ii) From the graph, determine the:

I. Planck’s constant;
III Work function of the metal.

### Question 2 ( No. 9. 2022 Physics WAEC Theory Past Question)

(a)(i) State Coulomb’s law of electrostatics.

(ii) The electron and proton of a hydrogen atom are separated by a mean distance of $$\scriptsize 5.2 \: \times \: 10^{-11} \: m$$

Calculate the magnitude of the electrostatic force between the particles.

[e  = 1.6 × 10-19 C, (4πε0)-1  = 9.0 × 109 mF-1]

(b)(i) The diagram below shows a potential divider circuit.

I. Show that Vout = $$\scriptsize V_{in} \left( \normalsize \frac{R_1}{R_1 \:+\: R_2}\right)$$

II. If $$\frac{V_{in}}{V_{out}}$$ = 2.5 and R1 = 30Ω, calculate R2.

iii. Define the volt.

(c) Explain why wood is not suitable for use as the core of transformers.

(d) State one application for the cathode ray tube.

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