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- Black surface is a better emitter of radiation as compared to the shiny surface and thus more heat is absorbed by thermometer A compared to thermometer B.
sharon kalunda answered the question on March 26, 2019 at 06:39
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When a sound wave travels from a dense to a less dense gas, its velocity changes. What wave property does this observation show?
(Solved)
When a sound wave travels from a dense to a less dense gas, its velocity changes. What wave property does this observation show?
Date posted:
March 26, 2019
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Answers (1)
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Best FM station broadcasts on a frequency of 250 KHz and the wavelength of its signals is 1200m.
(Solved)
Best FM station broadcasts on a frequency of 250 KHz and the wavelength of its signals is 1200m.
Calculate:
(i) The speed of radio waves in m/s
(ii) The wavelength of the signal of another station that broadcasts on a frequency of 200KHZ.
Date posted:
March 26, 2019
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Answers (1)
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State ONE factor that does not change as water moves from shallow to deep part.
(Solved)
State ONE factor that does not change as water moves from shallow to deep part.
Date posted:
March 26, 2019
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Answers (1)
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Figure below shows a displacement – time graph of a wave. The velocity of the wave is 50cm/s.
(Solved)
Figure below shows a displacement – time graph of a wave. The velocity of the wave is 50cm/s.
Determine the:
(i) Amplitude
(ii) Period
(iii) Wavelength
(iv) Frequency
Date posted:
March 26, 2019
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Answers (1)
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State THREE differences between light waves and sound waves.
(Solved)
State THREE differences between light waves and sound waves.
Date posted:
March 26, 2019
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Answers (1)
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A source generates 40 waves in a second. If the wavelength is 8.5 cm. Calculate the time taken to reach a wall 102 m from...
(Solved)
A source generates 40 waves in a second. If the wavelength is 8.5 cm. Calculate the time taken to reach a wall 102 m from the source.
Date posted:
March 26, 2019
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Answers (1)
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State one effect that would be observed when water waves pass from deep to shallow water.
(Solved)
State one effect that would be observed when water waves pass from deep to shallow water.
Date posted:
March 26, 2019
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Answers (1)
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Figure below shows the displacement – time graph for a certain wave
(Solved)
Figure below shows the displacement – time graph for a certain wave
Determine the frequency of the wave?
Date posted:
March 26, 2019
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Answers (1)
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Two identical springs of spring constant 3N/cm are used to support a load of 30N as shown. Determine the extension of each spring.
(Solved)
Two identical springs of spring constant 3N/cm are used to support a load of 30N as shown. Determine the extension of each spring.
Date posted:
March 26, 2019
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Answers (1)
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An experiment was performed to find out how the length L of a spiral spring varies with the compression force, F. The figure below shows...
(Solved)
An experiment was performed to find out how the length L of a spiral spring varies with the compression force, F. The figure below shows the variation.
(i) Draw a diagram of a possible set up of the apparatus
(ii) Over which range of the force does the spring obey Hooker’s law?
(iii) Suggest a reason for the shape of the graph between 40N and 60N
Date posted:
March 26, 2019
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Answers (1)
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State FOUR reasons why the efficiency of an electric motor is always less than 100%
(Solved)
State FOUR reasons why the efficiency of an electric motor is always less than 100%
Date posted:
March 26, 2019
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Answers (1)
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An un-insulated copper wire XY lies over the fixed wire A and B connected to a battery when the key in the circuit is closed,...
(Solved)
An un-insulated copper wire XY lies over the fixed wire A and B connected to a battery when the key in the circuit is closed, the wire XY experiences a force.
(i) In which direction does the wire XY- experience the force?
(ii) How do you determine the direction in (i) above
(iii) When is the force on the wire XY greatest?
(iv) What is the effect of reversing both the magnetic field and direction of flow of current?
(v) State TWO factors by which the force on XY can be decreased
Date posted:
March 26, 2019
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Answers (1)
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State the modification introduced in the modern buses so as to enhance stability
(Solved)
State the modification introduced in the modern buses so as to enhance stability
Date posted:
March 25, 2019
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Answers (1)
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State two factors that determine the stability of a vehicle
(Solved)
State two factors that determine the stability of a vehicle
Date posted:
March 25, 2019
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Answers (1)
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Why are people who are maimed or have lost one leg provided with crutches?
(Solved)
Why are people who are maimed or have lost one leg provided with crutches?
Date posted:
March 25, 2019
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Answers (1)
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Why is it very difficult to open a door from a point too close to hinges?
(Solved)
Why is it very difficult to open a door from a point too close to hinges?
Date posted:
March 25, 2019
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Answers (1)
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Sketch a diagram of a simple cell.
(Solved)
Sketch a diagram of a simple cell.
Date posted:
March 25, 2019
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Answers (1)
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The figure shows a device for closing a steam outlet
Determine the weight W that just holds the bar in the horizontal position shown.
(Solved)
The figure shows a device for closing a steam outlet
The area of the piston is 4.0 x 10-4 m2 and the pressure of the steam in the boiler
is 2.0 x 105Nm-2. Determine the weight W that just holds the bar in the horizontal
position shown.
Date posted:
March 25, 2019
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Answers (1)
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In an experiment, the diameter, of the patch was measured to be 200mm for an oil drop of radius 0.25mm. Determine the diameter of the...
(Solved)
In an experiment, the diameter, of the patch was measured to be 200mm for an oil drop of radius 0.25mm. Determine the diameter of the molecule of the oil.
Date posted:
March 25, 2019
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Answers (1)
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Two pins are hanging from a magnet as shown in the diagram below.
(Solved)
Two pins are hanging from a magnet as shown in the diagram below.
Explain why they do not hang vertically downwards.
Date posted:
March 25, 2019
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Answers (1)