During charging, oxidation and reduction takes place at the anode and cathode and one of the product resulting from these processes is hydrogen gas. The caps are therefore opened to allow the hydrogen gas escape effectively to the atmosphere. Failure to do so may cause pressure build up in the battery resulting to explosion.
Githiari answered the question on September 12, 2017 at 20:09
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Why do bus body builders build luggage compartments under the seats rather than on roof rack?
Date posted: September 9, 2017. Answers (1)
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Date posted: June 8, 2017. Answers (1)
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Figure 8 shows a uniform light bar resting horizontally on corks floating on water in two beakers A and B.
Explain why the bar tilts towards side A when equal amount of heat is supplied to each beaker.
Date posted: June 7, 2017. Answers (1)
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The light uniform bar in Figure 3 is in equilibrium. The two beakers A and B contain water at the same temperature. The two blocks are made of the same material.
If the temperature of the water in beaker A is now raised, explain why the beam tips to side A. Assume the solid does not expand.
Date posted: June 7, 2017. Answers (1)
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Figure 11 shows a depletion layer in an unbiased p-n junction.
State how a battery can be used to make the depletion layer narrower.
Date posted: June 7, 2017. Answers (1)
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Figure 12 shows a depletion layer in an unbiased p-n junction.
State how a battery can be used to make the depletion layer narrower.
Date posted: June 7, 2017. Answers (1)
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Figure 6 (a) and Figure 6 (b) show a p-n junction connected to a battery. It is observed that the current in figure (6) (a) is greater than the current in figure 6 (b).
State the reason for this observation.
Date posted: June 7, 2017. Answers (1)
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Figure 5 shows the circuit of a rectifier using four diodes D1, D2, D3 and D4.
Explain how a rectified output is produced from the set up when an a.c input is connected across AB.
Date posted: June 6, 2017. Answers (1)
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In the circuit in fig. 5, when the switch S is closed, the voltmeter shows a reading.
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Date posted: June 6, 2017. Answers (1)
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The following is part of a radioctive decay series.
Determine the values of a and b.
Date posted: June 6, 2017. Answers (1)
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Radium undergoes radioctive decay by emitting an alpha particle to form a daughter nuclide Q as in the reaction:
Determine the values of:
(a) x (b) y
Date posted: June 6, 2017. Answers (1)
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The equation below represents a nuclear reaction in which two deuterium nuclei fuse to form Helium and X.
(a) Determine the values of a and b.
(b) Identify X
Date posted: June 6, 2017. Answers (1)
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Figure 6, shows a narrow beam of radiation from a radioctive source, incident to a postcard. The emergent radiation passes through a magnetic field which perpendicular to the plane of the paper, and into the paper.
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Date posted: June 6, 2017. Answers (1)
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The following is a nuclear equation for a fission process resulting from the reaction of a neutron with a Uranium nucleus.
(i) Determine the values of of x and y
(ii) State the source of the energy released.
(iii) Explain how this reaction is made continuous in a nuclear reactor
Date posted: June 6, 2017. Answers (1)
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Figure 11 shows the path of radiation from a radioactive source. The field is perpendicular to the paper and directed out of the paper.
(a)Identify the radiation.
(b) (i) State the effect of the radiation on the gas inside the Geiger-Muller tube.
(ii) Explain how the large discharge current is created.
(c) The following is a nuclear equation for a fission process resulting from the reaction of a neutron with a Uranium nucleus.
(i) Determine the values of x and y.
ii) State the source of the energy released.
(iii)Explain how this reaction is made continuous in a nuclear reactor.
Date posted: June 6, 2017. Answers (1)
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A radioactive isotope of copper decays to form an isotope of Zinc as shown below.
Name the radiation emitted and give a reason for your answer.
Date posted: June 6, 2017. Answers (1)
- The following part of radioactive decay series
(Solved)
The following part of radioactive decay series
Determine the values of a and b
Date posted: June 6, 2017. Answers (1)
- A nuclear reaction is represented by the following equation. (Solved)
A nuclear reaction is represented by the following equation.
Determine the values of a and b
Date posted: June 6, 2017. Answers (1)
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The following represents a nuclear reaction involving the nuclide polonium Po.
Identify m, n and X
Date posted: June 6, 2017. Answers (1)
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Figure 4 shows the cross-section of a diffusion cloud chamber used to detect radiation from radioctive sources.
(i) State one function of each of the following:
Alcohol
Solid CO2
(ii) When radiation from the source enters the chamber, some white traces are observed. Explain how these traces are formed and state how the radiation is identified.
(iii) A leaf electroscope can also be used as a detector of radiation. State two advantages of the diffusion cloud chamber over the leaf electroscope as a detector.
Date posted: June 6, 2017. Answers (1)