A glass slide i.e. blackened with soot or paint lines are drawn close together using
a razor blade or pin.
Githiari answered the question on September 18, 2017 at 16:52
- A transformer of 480 turns in the primary coil is used to connect a 9 volt a.c electric device to a
240 v.a.c mains power supply....(Solved)
A transformer of 480 turns in the primary coil is used to connect a 9 volt a.c electric device to a
240 v.a.c mains power supply. Calculate the number of turns in the secondary coil.
Date posted: September 18, 2017. Answers (1)
- A researcher studying the behaviour of step- up transformer made the following
observations:
“More joules per coulomb and fewer coulombs per second at the output than at...(Solved)
A researcher studying the behaviour of step- up transformer made the following
observations:
“More joules per coulomb and fewer coulombs per second at the output than at the input terminals
Explain why the observation does not imply a violation of the principle of conservation of energy
Date posted: September 18, 2017. Answers (1)
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Define amplitude.
Date posted: September 18, 2017. Answers (1)
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State why optical fibres are preferred in communication to ordinary cables.
Date posted: September 18, 2017. Answers (1)
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State two defects of a simple cell and how each can be minimized.
Date posted: September 18, 2017. Answers (1)
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Give a reason why repulsion in magnetism is the surest way of testing polarity
Date posted: September 18, 2017. Answers (1)
- An electron in an excited atom falls from energy levels E2 to energy level E1. Write an equation
relating the energy change to the frequency f,...(Solved)
An electron in an excited atom falls from energy levels E2 to energy level E1. Write an equation
relating the energy change to the frequency f, of the radiation emitted. Explain why new symbols
used.
Date posted: September 18, 2017. Answers (1)
- Define the term acceleration.(Solved)
Define the term acceleration.
Date posted: September 18, 2017. Answers (1)
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State two factors that would raise the boiling point of water to above 100oC.
Date posted: September 18, 2017. Answers (1)
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Give a reason why weight of a body varies from one planet to another
Date posted: September 18, 2017. Answers (1)
- State two factors affecting conductivity of solids(Solved)
State two factors affecting conductivity of solids.
Date posted: September 18, 2017. Answers (1)
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Distinguish between a basic physical quantity and a derived physical quantity giving an example of each.
Date posted: September 18, 2017. Answers (1)
- What is the name given to the method of charging an electroscope where it requires an opposite charge to the one of the charging materials?(Solved)
What is the name given to the method of charging an electroscope where it requires an opposite charge to the one of the charging materials?
Date posted: September 18, 2017. Answers (1)
- A negatively, charged rod is brought close to (but not touching ) an uncharged sphere. If the sphere is momentarily earthed and then the...(Solved)
A negatively, charged rod is brought close to (but not touching ) an uncharged sphere. If the sphere is momentarily earthed and then the rod is removed, briefly explain what happens.
Date posted: September 18, 2017. Answers (1)
- Distinguish between mass and weight of a body stating the S.I units for each(Solved)
Distinguish between mass and weight of a body stating the S.I units for each.
Date posted: September 18, 2017. Answers (1)
- Define electric current and state its SI unit(Solved)
Define electric current and state its SI unit
Date posted: September 18, 2017. Answers (1)
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State two factors which affect pressure in liquids
Date posted: September 18, 2017. Answers (1)
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Name 3 types of forces that act without contact
Date posted: September 18, 2017. Answers (1)
- State three precautions that must be taken when using the density bottle(Solved)
State three precautions that must be taken when using the density bottle
Date posted: September 18, 2017. Answers (1)
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State why most braking systems use liquids and not gases.
Date posted: September 18, 2017. Answers (1)