Threshold frequency is the minimum frequency below which photoelectric effect will not occur. The threshold wavelength is the maximum wavelength above which photoelectric effect will not to be place.
sharon kalunda answered the question on September 12, 2019 at 09:13
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Give a reason why lecture theatre halls are covered with soft perforated materials.
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Give a reason why lecture theatre halls are covered with soft perforated materials.
Date posted:
September 12, 2019
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Answers (1)
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Explain why a p-n junction diode will conduct when connected in forward bias.
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Explain why a p-n junction diode will conduct when connected in forward bias.
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a combination of capacitors across a power supply.
(Solved)
The figure below shows a combination of capacitors across a power supply.
Determine the energy stored in the system of capacitors.
Date posted:
September 12, 2019
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Answers (1)
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State one differences between an image formed by a plane mirror and that observed through a pinhole camera.
(Solved)
State one differences between an image formed by a plane mirror and that observed through a pinhole camera.
Date posted:
September 12, 2019
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Answers (1)
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The diagram below shows an electrical appliance connected to the mains.
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The diagram below shows an electrical appliance connected to the mains.
I. Name the color codes for leads A and B
II. What is the purpose of the fuse.
Date posted:
September 12, 2019
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Answers (1)
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A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
(Solved)
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
Date posted:
September 12, 2019
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Answers (1)
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The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is...
(Solved)
The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is in liquid A. Density of liquid B is 800kg/m³
(Take g = 10N/kg).
a.Determine
(i) Weight of liquid B displacement.
(ii) Weight of liquid A displaced.
iii) Volume of A.
b.The sphere is now anchored at the base of the container that ¼ of its volume is in liquid A. Find the tension in the string.
Date posted:
September 12, 2019
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Answers (1)
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Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice...
(Solved)
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice is 0.9g/cm³
Date posted:
September 12, 2019
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Answers (1)
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Explain the energy change that occur when a man climbs the mountain.
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Explain the energy change that occur when a man climbs the mountain.
Date posted:
September 12, 2019
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Answers (1)
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A loudspeaker is a transducer. Explain.
(Solved)
A loudspeaker is a transducer. Explain.
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a tape from a trolley accelerating at 5m/s and the timer is vibrating at 100HZ.
(Solved)
The figure below shows a tape from a trolley accelerating at 5m/s and the timer is vibrating at 100HZ.
(i) Change in velocity from A to B.
(ii) The final velocity of the trolley.
Date posted:
September 12, 2019
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Answers (1)
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Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right and then...
(Solved)
Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right and then for 2 seconds by a constant force of 20N towards the left.
Date posted:
September 12, 2019
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Answers (1)
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A stone is thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as the apex and...
(Solved)
A stone is thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as the apex and came back. Another boy projected a stone horizontally from the top of the mountain. Calculate:
(a) Height of the mountain.
(b) Time taken for the stone to follow the trajectory.
(c) The range if the horizontal velocity is 20m/s.
Date posted:
September 12, 2019
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Answers (1)
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A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,determine...
(Solved)
A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,determine the speed of water in the wider pipe.
Date posted:
September 12, 2019
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Answers (1)
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A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure.Determine...
(Solved)
A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure.Determine the total extension.
Date posted:
September 12, 2019
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Answers (1)
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On the axis on figure below, sketch displacement time graph for accelerating body.
(Solved)
On the axis on figure below, sketch displacement time graph for accelerating body.
Date posted:
September 12, 2019
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Answers (1)
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Under what conditions can a feather and a stone released from the same height land on the ground at the same time?
(Solved)
Under what conditions can a feather and a stone released from the same height land on the ground at the same time?
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer screw gauge.
(Solved)
The figure below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer screw gauge.
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a match stick floating on the surface of water in a basin.
(Solved)
The figure below shows a match stick floating on the surface of water in a basin.
When a drop of soap solution was carefully added to the water at A, the match stick is observed to move in a certain direction. State the direction of this match using A and B and explain this observation.
Date posted:
September 11, 2019
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Answers (1)
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An object is placed 15cm from a converging lens of focal length 20cm. calculate the image position.
(Solved)
An object is placed 15cm from a converging lens of focal length 20cm. calculate the image position.
Date posted:
September 11, 2019
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Answers (1)