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To control the number of electrons reaching the screen; control the brightness of the screen.
chrispohmomanyi answered the question on October 5, 2017 at 10:32
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State two uses of radioactivity in hospitals.
Date posted: October 5, 2017. Answers (1)
- Silicon was dipped with boron to form an extrinsic semi-conductor. What are the majority charge carriers in it. (Solved)
Silicon was dipped with boron to form an extrinsic semi-conductor. What are the majority charge carriers in it.
Date posted: October 5, 2017. Answers (1)
- State two functions of a gold leaf electroscope.(Solved)
State two functions of a gold leaf electroscope.
Date posted: October 5, 2017. Answers (1)
- Explain why the leaf of a positively charged electroscope falls when a candle flame is brought near its cap.(Solved)
Explain why the leaf of a positively charged electroscope falls when a candle flame is brought near its cap.
Date posted: October 5, 2017. Answers (1)
- State four possible sources of background radiation.(Solved)
State four possible sources of background radiation.
Date posted: October 5, 2017. Answers (1)
- Explain what is meant by background radiation.(Solved)
Explain what is meant by background radiation.
Date posted: October 5, 2017. Answers (1)
- State two applications of moments.(Solved)
State two applications of moments.
Date posted: October 5, 2017. Answers (1)
- Explain how wavelength varies with depth of water in a tank of variable length.(Solved)
Explain how wavelength varies with depth of water in a tank of variable length.
Date posted: October 5, 2017. Answers (1)
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A tungsten filament lamp contains Argon gas at low pressure. Why is air not used?
Date posted: October 5, 2017. Answers (1)
- What is the difference between P-type and N-type semiconductors.(Solved)
What is the difference between P-type and N-type semiconductors.
Date posted: October 5, 2017. Answers (1)
- A racing car moving at 100 m/s had its brakes applied so that there is a constant retardation of 0.5 m/s^2. Find the time taken...(Solved)
A racing car moving at 100 m/s had its brakes applied so that there is a constant retardation of 0.5 m/s^2. Find the time taken before the racing car stops.
Date posted: October 4, 2017. Answers (1)
- A scout blew a trumpet some distance from a wall, and heard its echo after 3.6 seconds later. How far is the wall from the...(Solved)
A scout blew a trumpet some distance from a wall, and heard its echo after 3.6 seconds later. How far is the wall from the scout? (speed of sound in air is 330 m/s)
Date posted: October 4, 2017. Answers (1)
- An insulated copper wire rolled on an iron core results to an electromagnet. State two changes that can increase the strength of the electromagnet.(Solved)
An insulated copper wire rolled on an iron core results to an electromagnet. State two changes that can increase the strength of the electromagnet.
Date posted: October 4, 2017. Answers (1)
- Manganese dioxide is used in a dry cell. State its use.(Solved)
Manganese dioxide is used in a dry cell. State its use.
Date posted: October 4, 2017. Answers (1)
- Name one form of energy other than heat produced by a red-hot electric element.(Solved)
Name one form of energy other than heat produced by a red-hot electric element.
Date posted: October 4, 2017. Answers (1)
- What is kilowatt hour?(Solved)
What is kilowatt hour?
Date posted: October 4, 2017. Answers (1)
- State one property of electromagnetic waves.(Solved)
State one property of electromagnetic waves.
Date posted: October 4, 2017. Answers (1)
- State the condition under which a converging lens is used as a magnifying glass.(Solved)
State the condition under which a converging lens is used as a magnifying glass.
Date posted: October 4, 2017. Answers (1)
- State two ways of increasing the size of the image in a pinhole camera.(Solved)
State two ways of increasing the size of the image in a pinhole camera.
Date posted: October 4, 2017. Answers (1)
- State the type of wave produced when a wire fixed at both ends is jerked. (Solved)
State the type of wave produced when a wire fixed at both ends is jerked.
Date posted: October 4, 2017. Answers (1)