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The atoms that introduce holes in the pure semiconductors.
sharon kalunda answered the question on September 27, 2019 at 10:14
- Sketch a circuit diagram that can be used to investigate p-n junction diode characteristics.(Solved)
Sketch a circuit diagram that can be used to investigate p-n junction diode characteristics.
Date posted: September 27, 2019. Answers (1)
- State the meaning of the statement diode characteristic curve.(Solved)
State the meaning of the statement diode characteristic curve.
Date posted: September 27, 2019. Answers (1)
- The figure below shows an experimental arrangement. S1 and S2 are narrow slits.(Solved)
The figure below shows an experimental arrangement. S1 and S2 are narrow slits.
State what is observed on the screen when the source is:
(i) Monochromatic
(ii) White light
Date posted: September 27, 2019. Answers (1)
- An observer watching a fireworks displays sees the light from an explosion and hears the sound 4 seconds later. How far was the explosion from...(Solved)
An observer watching a fireworks displays sees the light from an explosion and hears the sound 4 seconds later. How far was the explosion from the observer? (Speed of sound in air 330m/s).
Date posted: September 27, 2019. Answers (1)
- A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The...(Solved)
A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The distance from the centre of the table to the block is 15cm. If the maximum tension the thread can withstand is 5.6N, determine the maximum angular velocity the table can attain before the thread cuts.
Date posted: September 27, 2019. Answers (1)
- The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.(Solved)
The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.
Determine the mass of the metal rod if the tension is 15N.
Date posted: September 27, 2019. Answers (1)
- A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that...(Solved)
A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that can be placed on the block so that its top is level with the surface of water.
Date posted: September 27, 2019. Answers (1)
- Calculate the total power in lifting 0.2kg of metal cane containing 2000cm3 of ice onto a lorry as shown below within 4s. (SI Q =...(Solved)
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm3 of ice onto a lorry as shown below within 4s. (SI Q = 0.9g/cm3)
Date posted: September 27, 2019. Answers (1)
- The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m....(Solved)
The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m. Calculate the load L which causes an extension of 28m to the system.
Date posted: September 27, 2019. Answers (1)
- State any two possible ways of increasing velocity ratio of wheel and axle.(Solved)
State any two possible ways of increasing velocity ratio of wheel and axle.
Date posted: September 27, 2019. Answers (1)
- What does it mean to say the density of water is 1g/cm3?(Solved)
What does it mean to say the density of water is 1g/cm3?
Date posted: September 27, 2019. Answers (1)
- The diagram below shows two similar cups of tea containing equal volumes of hot tea at the same level. It was observed that the rate...(Solved)
The diagram below shows two similar cups of tea containing equal volumes of hot tea at the same level. It was observed that the rate of cooling was the same in the two cups. Explain.
Date posted: September 27, 2019. Answers (1)
- A body is acted upon by a force of 10N towards the right hand side and 6N towards the left hand side. What is the...(Solved)
A body is acted upon by a force of 10N towards the right hand side and 6N towards the left hand side. What is the resultant force?
Date posted: September 27, 2019. Answers (1)
- The figure below shows a displacement-time graph of a wave. The velocity of the wave is 100m/s.(Solved)
The figure below shows a displacement-time graph of a wave. The velocity of the wave is 100m/s.
Determine;
(i) Amplitude
(ii) Period
(iii) Wave length
(iv) Frequency
Date posted: September 27, 2019. Answers (1)
- A gas occupies a volume of 4000 litres temperature of 370C and normal atmosphere pressure. Determine the new volume of the gas if it is...(Solved)
A gas occupies a volume of 4000 litres temperature of 370C and normal atmosphere pressure. Determine the new volume of the gas if it is heated at constant pressure to a temperature of 670C (normal atmosphere pressure P = 1.01 x 105pa).
Date posted: September 27, 2019. Answers (1)
- A turn table of radius 8cm is rotating at 33 revolutions per second. Determine the linear speed of a point on the circumference of the...(Solved)
A turn table of radius 8cm is rotating at 33 revolutions per second. Determine the linear speed of a point on the circumference of the turn table.
Date posted: September 27, 2019. Answers (1)
- The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a...(Solved)
The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a horizontal bench.
State and explain the effects on stability of the block when the hollow section is filled with water.
Date posted: September 27, 2019. Answers (1)
- The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are...(Solved)
The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are suspected at distance X1 and X2 from a metal cube filled with boiling water and placed on an insulating material.
a. State the mode by which heat travels from the cubes to the balloons.
b. The face of the cube towards A is bright and shiny and face towards B is dull black. State with reasons the adjustments that should be made on the distances XI and X2 so that the rate of change of temperature in both balloons remains the same
Date posted: September 27, 2019. Answers (1)
- Give a reason why a person may nose bleed after ascending a high mountain.(Solved)
Give a reason why a person may nose bleed after ascending a high mountain.
Date posted: September 27, 2019. Answers (1)
- The figure below shows water placed in a measuring cylinder calibrated in cm3(Solved)
The figure below shows water placed in a measuring cylinder calibrated in cm3
An object of mass 50.1g and density 16.7 g/cm3 is lowered gently in the water.Calculate the new volume level
Date posted: September 27, 2019. Answers (1)