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.
(Solved)
State two uses of radioactivity in hospitals.
Date posted:
October 5, 2017
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Answers (1)
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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
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Answers (1)
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State two functions of a gold leaf electroscope.
(Solved)
State two functions of a gold leaf electroscope.
Date posted:
October 5, 2017
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Answers (1)
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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
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Answers (1)
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State four possible sources of background radiation.
(Solved)
State four possible sources of background radiation.
Date posted:
October 5, 2017
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Answers (1)
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Explain what is meant by background radiation.
(Solved)
Explain what is meant by background radiation.
Date posted:
October 5, 2017
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Answers (1)
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State two applications of moments.
(Solved)
State two applications of moments.
Date posted:
October 5, 2017
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Answers (1)
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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
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Answers (1)
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A tungstern filament lamp contains Argon gas at low pressure. Why is air not used?
(Solved)
A tungsten filament lamp contains Argon gas at low pressure. Why is air not used?
Date posted:
October 5, 2017
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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What is kilowatt hour?
(Solved)
What is kilowatt hour?
Date posted:
October 4, 2017
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Answers (1)
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State one property of electromagnetic waves.
(Solved)
State one property of electromagnetic waves.
Date posted:
October 4, 2017
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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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
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Answers (1)
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State one condition required for electromagnetic induction to occur.
(Solved)
State one condition required for electromagnetic induction to occur.
Date posted:
October 4, 2017
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Answers (1)
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State one advantage of fitting wide tyres on a vehicle that moves on murram roads.
(Solved)
State one advantage of fitting wide tyres on a vehicle that moves on murram roads.
Date posted:
October 4, 2017
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Answers (1)
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State two applications of friction force.
(Solved)
State two applications of friction force.
Date posted:
October 4, 2017
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Answers (1)