Doping is adding Small impurities called dopants into an intrinsic semiconductor. It is carried out to increase conductivity of a semiconductor.
Joseph lance answered the question on February 14, 2018 at 20:14
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A screw jack 25% efficient and having a screw pitch of 0.4cm is used to raise a load through a certain height. If the process...
(Solved)
A screw jack 25% efficient and having a screw pitch of 0.4cm is used to raise a load through a certain height. If the process the handle turns through a circle of radius 40cm. Calculate the
1. Velocity ratio of the machine
2. Mechanical advantage of the machine
3. Effort required to raise a load of 1000N with the machine ( take pi =3 1/4)
Date posted:
February 12, 2018
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Answers (1)
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A boy keeps a balloon inflated with air is refrigerator. State and explain the observations made.
(Solved)
A boy keeps a balloon inflated with air is refrigerator. State and explain the observations made.
Date posted:
February 9, 2018
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Answers (1)
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An engineer is contracted to construct a permanent house on a sandy soil. What measure would he take to make sure the house does not...
(Solved)
An engineer is contracted to construct a permanent house on a sandy soil. What measure would he take to make sure the house does not sink?
Date posted:
February 9, 2018
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Answers (1)
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State one reason why racing cars are stable.
(Solved)
State one reason why racing cars are stable.
Date posted:
February 9, 2018
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Answers (1)
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State two factors that determines the efficiency of an inclined plane as a machine
(Solved)
State two factors that determines the efficiency of an inclined plane as a machine
Explain how these factors affect efficiency
Date posted:
February 9, 2018
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Answers (1)
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Two objects made of the same material and having the same mass are heated to a temperature of 35oC above that of the atmosphere and...
(Solved)
Two objects made of the same material and having the same mass are heated to a temperature of 35oC above that of the atmosphere and then allowed to cool in still air for 30 minutes. State one factor that will determine their final temperature
Date posted:
February 9, 2018
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Answers (1)
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A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of...
(Solved)
A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation
Date posted:
February 9, 2018
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Answers (1)
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Define crystal cleavage
(Solved)
Define crystal cleavage
Date posted:
February 9, 2018
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Answers (1)
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State one factor that a bimetallic strip relies on for its working
(Solved)
State one factor that a bimetallic strip relies on for its working
Date posted:
February 9, 2018
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Answers (1)
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State one way a camera differs from the human eye.
(Solved)
State one way a camera differs from the human eye.
Date posted:
February 9, 2018
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Answers (1)
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The SI unit of capacitance is the Farad. Define the Farad.
(Solved)
The SI unit of capacitance is the Farad. Define the Farad.
Date posted:
February 9, 2018
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Answers (1)
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What property of cathode rays is demonstrated by the maltese cross?
(Solved)
What property of cathode rays is demonstrated by the maltese cross?
Date posted:
February 9, 2018
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Answers (1)
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State two operational differences between the C.R.O and the T.V tube.
(Solved)
State two operational differences between the C.R.O and the T.V tube.
Date posted:
February 9, 2018
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Answers (1)
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State any two maintenance practices for secondary cells
(Solved)
State any two maintenance practices for secondary cells
Date posted:
February 9, 2018
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Answers (1)
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How does intensity of radiation incident on a metal surface affect the photoelectrons emitted.
(Solved)
How does intensity of radiation incident on a metal surface affect the photoelectrons emitted.
Date posted:
February 9, 2018
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Answers (1)
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What is meant by threshold wavelength? ...
(Solved)
What is meant by threshold wavelength?
Date posted:
February 9, 2018
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Answers (1)
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State two ways of increasing the capacitance of a capacitor.
(Solved)
State two ways of increasing the capacitance of a capacitor.
Date posted:
February 9, 2018
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Answers (1)
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State and explain the applications of capacitors
(Solved)
State and explain the applications of capacitors.
Date posted:
February 9, 2018
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Answers (1)
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When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or...
(Solved)
When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or pick them up. He concluded that there was no transfer of electric charge between the duster and the brass rod. He was wrong. Give a reason why he was wrong
Date posted:
February 9, 2018
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Answers (1)
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State the applications of total internal reflection
(Solved)
State the applications of total internal reflection.
Date posted:
February 9, 2018
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Answers (1)