# WAEC GCE PHYSICS QUESTIONS AND ANSWERS

We will post the 2022 waec gce physics questions and answers here on this post.

(2a) Light Amplification by the Stimulated Emission of Radiation.

(2b)
(i) In Medicine.
(ii) In Communication.
(iii) In Military.
(iv) In Industry.

(2c)
(i) Intrinsic Semiconductors are Pure in form, no form of impurity is added to them. *WHILE* Extrinsic Semiconductors are impure, contains the doping of Trivalent or Pentavalent Impurities.

*The characteristics of liquid pressure are:*

*Liquid pressure increases with depth.*

*Liquid pressure remains the same in all directions at a given depth.*

*Liquid pressure depends upon the density of the liquid.*

Liquid exerts pressure on the sides of the container.

A liquid seeks its own level.

(10a)

(i) Source of light should be monochromatic.

(ii) Wavelength of the light used should be comparable to the size of obstacle.

(1). At maximum range, Ø= 45°

U= Initial Velocity= 200m/s

g= acceleration due to gravity= 10m/s²

Maximum Height, h(max.)= (U²Sin²∅)/2g
= ((200)²(Sin 45°)²)/2(10)
= ((40000)((√2)/2)²)/20
= (40000 × 2/4)/20
= (10000 × 2)/20
= 20000/20
= 1000
h(max.)= 1000m

Thus, the maximum height is 1000m.

(2a) Light Amplification by the Stimulated Emission of Radiation.

(2b)
(i) In Medicine.
(ii) In Communication.
(iii) In Military.
(iv) In Industry.

(2c)
(i) Intrinsic Semiconductors are Pure in form, no form of impurity is added to them. *WHILE* Extrinsic Semiconductors are impure, contains the doping of Trivalent or Pentavalent Impurities.

Wavelength: this is the distance between two successive troughs (or two points in phase) of a wave

Amplitude: this is the maximum displacement of a particle from it rest position

10b

i). Wavefront is defined as the imaginary surface constructed by the locus of all points of a wave that have the same phase, i.e. have the identical path length from the source of that wave. … For parallel rays, the wavefront is a plane surface, whereas for diverging or converging rays, the wavefront is spherical.

8ai

crystalline substance is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

8aii.

(a) i. quartz

ii. calcite

iii. sugar

iv. diamonds

pick any two(2)

(b) i. plastics

ii. glass

iii. rubber

iv. metallic glass

pick any two(2)

ii) Wavelength is the distance from one crest to another, or from one trough to another, of a wave (which may be an electromagnetic wave, a sound wave, or any other wave). … This means the longer the wavelength, lower the frequency. In the same manner, shorter the wavelength, higher will be the frequency.

*OR*

Wavelength: this is the distance between two successive troughs (or two points in phase) of a wave

iii) Amplitude: this is the maximum displacement of a particle from it rest position

(10a)

i. Source of light should be monochromatic.

ii. Wavelength of the light used should be comparable to the size of obstacle.

(10b)

(i)

*Wave front* is defined as a surface over which the phase of the wave is constant. In a particular wave front, at a given moment of time, all particles of the medium are undergoing the same motion.

(ii)

*Wavelength* can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave.

Wavelength is the distance from one crest to another, or from one trough to another, of a wave (which may be an electromagnetic wave, a sound wave, or any other wave). Crest is the highest point of the wave whereas the trough is the lowest. Since wavelength is distance/length, it is measured in units of lengths such as metres, centimetres, milimetres, nanometres, etc.

(iii)

*Antinode* is simply a point along a medium which undergoes maximum displacement above and below the rest position.

The position or points in the string where the amplitude of vibration is maximum are called antinodes

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