2022 WAEC GCE Physics (Essay & OBJ) Answers [9th February]
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WAEC GCE JANUARY/FEBRUARY 2022 FREE PHYSICS (PHY) QUESTION AND ANSWER ROOM [PRIVATE CANDIDATES]

Wednesday, 9th February, 2022
Physics 2 (Essay) – 8:30am – 10:00am
Physics 1 (Objective) – 10:00am – 11:15am
Physics 3 (Alternative to Practical Work) – 1:00pm – 3:45pm

A. 2022 WAEC GCE PHYSICS ESSAY (THEORY) ANSWERS | 9TH FEBRUARY, 2022

(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.

(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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B. 2022 WAEC GCE PHYSICS OBJECTIVES (OBJ) ANSWERS | 9TH FEBRUARY, 2022

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C. 2022 WAEC GCE PHYSICS PRACTICAL ANSWERS | 9TH FEBRUARY, 2022

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