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L2 lights, L1 and L3 do not.
D2 is forward biased while D1 and D3 are reversed biased.
sharon kalunda answered the question on September 26, 2019 at 06:58
- A radio signal of 30MHz is received by an aerial whose length is 0.125 of its wavelength. If the speed of light is 3.0x108 m/s...(Solved)
A radio signal of 30MHz is received by an aerial whose length is 0.125 of its wavelength. If the speed of light is 3.0x108 m/s determine the length of the aerial.
Date posted: September 26, 2019. Answers (1)
- The figure below shows a thin wire connected to a charge generator and placed close to a candle flame.(Solved)
The figure below shows a thin wire connected to a charge generator and placed close to a candle flame.
Explain why the candle flame is deflected as shown.
Date posted: September 26, 2019. Answers (1)
- Explain why it is dangerous for a bus to carry standing passengers.(Solved)
Explain why it is dangerous for a bus to carry standing passengers.
Date posted: September 26, 2019. Answers (1)
- The diagram below shows a wire loop with two threads tied across it. The loop is dipped into a soap solution such that the soap...(Solved)
The diagram below shows a wire loop with two threads tied across it. The loop is dipped into a soap solution such that the soap film covers it as shown.
Region B is punctured such that the soap film in that section is broken. On the space alongside the diagram sketch the resulting shape of the wire loop. Give a reason for the shape.
Date posted: September 26, 2019. Answers (1)
- A pin is placed at the bottom of the beaker of depth 14.5cm. The beaker is then filled with Kerosene. By using another pin on...(Solved)
A pin is placed at the bottom of the beaker of depth 14.5cm. The beaker is then filled with Kerosene. By using another pin on the side of the beaker and observing from the top, the distance of image of the pin in the beaker is found to be 4.5cm from the bottom.Determine the refractive index of kerosene.
Date posted: September 12, 2019. Answers (1)
- The figure below shows two polythene spheres P and Q suspended using nylon thread.(Solved)
The figure below shows two polythene spheres P and Q suspended using nylon thread.
Draw a diagram to show how the two spheres would behave if only P is rubbed with a cloth.
Date posted: September 12, 2019. Answers (1)
- A diverging lens of focal length 10cm produces a virtual image half the size of the object. Find the distance between the object from the...(Solved)
A diverging lens of focal length 10cm produces a virtual image half the size of the object. Find the distance between the object from the lens.
Date posted: September 12, 2019. Answers (1)
- In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:(Solved)
In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:
Mass of empty density bottle = 43.2g
Mass of density bottle full of water = 66.4g
Mass of density bottle with some sand = 67.5g
Mass of density bottle with the sand filled up with water = 82.3g
Use the above data to determine the;
a) Mass of the water that completely filled the bottle.
b) Volume of water that completely filled with the bottle.
c) Volume of the density bottle;
d) Mass of sand
e) Mass of water that filled the space above the sand.
f) Volume of the sand
g) Density of the sand
Date posted: September 12, 2019. Answers (1)
- A solid weighs 18.5N on the surface of the moon. The force of gravity on the moon is 1.7N/kg. Determine the mass of the solid.(Solved)
A solid weighs 18.5N on the surface of the moon. The force of gravity on the moon is 1.7N/kg. Determine the mass of the solid.
Date posted: September 12, 2019. Answers (1)
- The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the...(Solved)
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the object.
i) State the type of lens used.
ii) Determine the object distance.
iii) Determine the radius of curvature.
iv) State one application of the lens as used in question (b) above.
Date posted: September 12, 2019. Answers (1)
- What is meant by a step-up transformer?(Solved)
What is meant by a step-up transformer?
Date posted: September 12, 2019. Answers (1)
- The figure below shows part of the lighting circuit of a house.(Solved)
The figure below shows part of the lighting circuit of a house.
i) Explain why a fuse is included in the circuit.
ii) Explain why the fuse is placed in the live wire rather than in the neutral wire.
iii) Each lamp has a power of 60 W. Calculate the current through one lamp when it is switched on.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current...(Solved)
The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current passes through it.
i) Label the polarities of the magnets A and B.
ii) Explain the behaviour of the flexible wire.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m(Solved)
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
Calculate the:
i) Weight of sea water displaced by the buoy (density of sea water = 1100kgm-3)
ii) Upward force exerted on the buoy by the water.
iii) The tension on the string.
Date posted: September 12, 2019. Answers (1)
- The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace...(Solved)
The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace the ray of light through the mirrors.
Date posted: September 12, 2019. Answers (1)
- State the unit specific latent heat of a substance.(Solved)
State the unit specific latent heat of a substance.
Date posted: September 12, 2019. Answers (1)
- The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.(Solved)
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
X and Y are metal contact while P and Q are identical bulbs. Explain the effect on the bulb when ice cold water is poured onto the strip.
Date posted: September 12, 2019. Answers (1)
- Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.(Solved)
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
Determine the total extension of the system.
Date posted: September 12, 2019. Answers (1)
- The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied....(Solved)
The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied. Calculate the distance traveled after the brakes were applied.
Date posted: September 12, 2019. Answers (1)
- Distinguish between threshold frequency and threshold wavelength.(Solved)
Distinguish between threshold frequency and threshold wavelength.
Date posted: September 12, 2019. Answers (1)