(i) Y;
(ii) Forward biased
Wilfykil answered the question on October 2, 2019 at 07:52
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The energy of a radiation is 3.8 x10-14 J.
(Solved)
The energy of a radiation is 3.8 x10-14 J. Determine the wavelength of the radiation
( h = 6.63x10-34JS,C=3.0 x 108m/s)
Date posted:
October 2, 2019
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Answers (1)
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Arrange the following radiations in order of increasing wavelength
(Solved)
Arrange the following radiations in order of increasing wavelength; Ultra-violet, Microwaves, Blue light, Yellow light
Date posted:
October 2, 2019
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Answers (1)
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Figure below shows an object at the bottom of a water container. Draw rays on the diagram to show the object as viewed from above.
(Solved)
Figure below shows an object at the bottom of a water container. Draw rays on the diagram to show the object as viewed from above.
Date posted:
October 1, 2019
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Answers (1)
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A girl looks into a plane mirror 3 m in front of her and sees the image of the wall which is 2.5 m behind her. What...
(Solved)
A girl looks into a plane mirror 3 m in front of her and sees the image of the wall which is 2.5 m behind her. What is the difference between the girl’s eyes and the image of the wall?
Date posted:
October 1, 2019
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Answers (1)
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It is observed that when a magnet breaks up into two, each of the pieces retains the characteristics of the original magnet. Explain
(Solved)
It is observed that when a magnet breaks up into two, each of the pieces retains the characteristics of the original magnet. Explain
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a bimetallic strip made of copper and iron at room temperature
If copper expands more than iron. Identify A and B if...
(Solved)
The figure below shows a bimetallic strip made of copper and iron at room temperature
If copper expands more than iron. Identify A and B if the bimetallic strip is placed in a refrigerator whose temperature is -700c.
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows how volume of a given mass of water varies with temperature.
sketch a graph of density against Temperature.
(Solved)
The figure below shows how volume of a given mass of water varies with temperature.
sketch a graph of density against Temperature.
Date posted:
October 1, 2019
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Answers (1)
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The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete...
(Solved)
The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete the table for the extension e above.
(II) Plot a graph of load (y-axis) against extension
(III) From the graph determine the springs constant
(IV) Calculate the energy stored when the spring is stretched to 16 cm.
Date posted:
October 1, 2019
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Answers (1)
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A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i)...
(Solved)
A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i) The horizontal velocity with which the stone is released
(ii) Sketch a graph of horizontal velocity against time from the time the stone is released to when it reaches the ground.
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension...
(Solved)
The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension for a wire form which the spring is made.
(ii) Explain the difference between the two lines drawn
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a section of a tape from a ten tick timer whose frequency is 50 Hz.
Calculate;
(i) The average velocity of the...
(Solved)
The figure below shows a section of a tape from a ten tick timer whose frequency is 50 Hz.
Calculate;
(i) The average velocity of the trolley between points
1. WX
2. YZ
(ii) Find the acceleration of the trolley.
Date posted:
October 1, 2019
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Answers (1)
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The velocity time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of...
(Solved)
The velocity time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of a planet. The weight of the ball on earth is 30N
Determine the weight of a ball on the planet
Date posted:
October 1, 2019
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Answers (1)
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A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible...
(Solved)
A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible regions should reduce injury in a car crash.
Date posted:
October 1, 2019
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Answers (1)
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State one way of making surface tension of water stronger.
(Solved)
State one way of making surface tension of water stronger.
Date posted:
October 1, 2019
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Answers (1)
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Explain the washing effect of soap.
(Solved)
Explain the washing effect of soap.
Date posted:
October 1, 2019
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Answers (1)
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A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk...
(Solved)
A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk after 4 cm.
(a) Calculate the average resistance force offered by the trunk to the bullet.
(b) State the energy changes that takes place.
Date posted:
October 1, 2019
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Answers (1)
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Explain why a hole in a ship near the bottom is more dangerous than the one near the top
(Solved)
Explain why a hole in a ship near the bottom is more dangerous than the one near the top
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation
(Solved)
The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation
Date posted:
October 1, 2019
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Answers (1)
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A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the...
(Solved)
A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the tension in the string.
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain...
(Solved)
The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain unchanged as the temperature increases
Date posted:
October 1, 2019
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Answers (1)