WAEC GCE(FIRST SERIES)2022 PHYSICS ESSAY, OBJ AND PRACTICAL-ANSWERS

PHYSICS PRACTICAL-ANSWWERS-EXAMKING.NET °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°PHYSICS-OBJ-ANSWWERS 1CDADBDBCDA 11BDDDCCDCCC 21BACBBDADCC 31AACBBABDAA 41DABBBDCBBD Completed °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° PHYSICS ESSAY-ANSWWERS (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…

PHYSICS PRACTICAL-ANSWWERS-EXAMKING.NET







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PHYSICS-OBJ-ANSWWERS
1CDADBDBCDA
11BDDDCCDCCC
21BACBBDADCC
31AACBBABDAA
41DABBBDCBBD
Completed
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PHYSICS ESSAY-ANSWWERS
(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.
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(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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(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.
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