1998 - JAMB Physics Past Questions and Answers - page 5
41
The electrochemical equivalent of a metal is 1.3 x 10-7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
A
6.5 x 10-2kg
B
2.6 x 10-2kg
C
6.5 x 10-3kg
D
2.6 x 10-3kg
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42
In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10-6kg. The amount of energy obtained from the fusion is
A
3.0 x 10-4J
B
3.0 x 10-1J
C
9.0 x 104J
D
9.0 x 1010J
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43
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
A
greater than the work function
B
less than the work function
C
equal to the work function
D
equal to the maximium kinetic energy of the electron
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44
A
5N in the direction of east
B
5N in the diretion of west
C
5V3N in the direction of west
D
10N in the southwest direction
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45
A
18.0Ω
B
11.0Ω
C
4.0Ω
D
2.0Ω
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46
A
5000π Hz
B
2500π Hz
C
5000/π Hz
D
2500/π Hz
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