The value of F in the figure above when in equilibrium is
10N
12N
20N
27N
Correct answer is C
F = \(\frac{17}{sin 60} = \frac{17}{0.866}\)
= 20N
20o
18o
35o
25o
Correct answer is D
No explanation has been provided for this answer.
When a pentavalent impurity is added to a pure semiconductor, it becomes?
a p-type semiconductor
an n-type semiconductor
an insulator
an intrinsic semi-conductor
Correct answer is B
When a pentavalent (5 outer electron)atom is added to a pure semiconductor, there is an extra electrons which does not take part in the covalent bonding resulting in an n-type semiconductor.
Which of the following can conduct electricity owing to the presence of free mobile electrons?
germanium
silicon
grapefruit
copper
Correct answer is D
Metals are good conductors due to the presence of free electrons.
Thermionic emission is the process whereby?
β - rays are produced
holes are produced
x - rays are produced
electrons leave a hot element
Correct answer is D
Thermionic emission is ejection of electron from a metal surface as a result of heating.
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