WO - minimum energy required to dislodged an electron from the surface of clean metallic surface.
The larger the WO the fewer the number of electrons emitted.
sharon kalunda answered the question on May 30, 2019 at 14:58
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State one similarity between ultraviolet rays and gamma rays in terms of their dangers.
(Solved)
State one similarity between ultraviolet rays and gamma rays in terms of their dangers.
Date posted:
May 30, 2019
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Answers (1)
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A 2kW electric heater is used for 10 hrs. Calculate the cost of electricity if its costs Kshs 30 per unit.
(Solved)
A 2kW electric heater is used for 10 hrs. Calculate the cost of electricity if its costs Kshs 30 per unit.
Date posted:
May 30, 2019
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Answers (1)
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A heater is rated 3kW, 240V. The fuses available are marked 10A, 13A and 20A. Which fuse is most suitable?
(Solved)
A heater is rated 3kW, 240V. The fuses available are marked 10A, 13A and 20A. Which fuse is most suitable?
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of...
(Solved)
The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of the pin is 80mm form the lens.
Determine the length of the image.
Date posted:
May 30, 2019
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Answers (1)
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How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?
(Solved)
How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?
Date posted:
May 30, 2019
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Answers (1)
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A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being...
(Solved)
A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being created varies with number of strokes.
Date posted:
May 30, 2019
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Answers (1)
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A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
(Solved)
A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
Date posted:
May 30, 2019
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Answers (1)
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An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State...
(Solved)
An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State what happens to the reading.
(ii) Explain the force that causes observation in (i) above.
Date posted:
May 30, 2019
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Answers (1)
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A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
(Solved)
A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
Date posted:
May 30, 2019
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Answers (1)
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Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a...
(Solved)
Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a cylinder of carbon dioxide.
Describe how particles of carbon dioxide exert pressure.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
(Solved)
The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
Date posted:
May 30, 2019
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Answers (1)
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A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i)...
(Solved)
A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i) Upthrust on the solid when floating.
ii) Density of the liquid.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added...
(Solved)
The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added to the beaker.
Show on the figure the new pointer position.
Date posted:
May 30, 2019
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Answers (1)
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The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate...
(Solved)
The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate and label on the diagram the forces acting on the cork.
ii) Write an expression showing the relationship between the forces.
Date posted:
May 30, 2019
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Answers (1)
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On the set of axes below show how the volume of an ideal gas varies with pressure.
(Solved)
On the set of axes below show how the volume of an ideal gas varies with pressure.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a ball being whirled in a vertical plane.
Sketch on the figure the path followed by the ball if the string cuts...
(Solved)
The figure below shows a ball being whirled in a vertical plane.
Sketch on the figure the path followed by the ball if the string cuts when the ball is in the position shown in the figure.
Date posted:
May 30, 2019
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Answers (1)
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A motor car is uniformly retarded and brought to rest from a speed of 108 km/h in 15 sec. Find its acceleration.
(Solved)
A motor car is uniformly retarded and brought to rest from a speed of 108 km/h in 15 sec. Find its acceleration.
Date posted:
May 30, 2019
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Answers (1)
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The figure shows an instrument used to measure atmospheric pressure.
a) Name the instrument.
b) Name the liquid marked L.
(Solved)
The figure shows an instrument used to measure atmospheric pressure.
a) Name the instrument.
b) Name the liquid marked L.
Date posted:
May 30, 2019
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Answers (1)
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A man has 2m³ of concrete delivered to his home and he needed to carry it down in a wheelbarrow. If each barrow load weighs...
(Solved)
A man has 2m³ of concrete delivered to his home and he needed to carry it down in a wheelbarrow. If each barrow load weighs 2500N, how many trips will he have to make?
(Density of concrete = 3000kgm-3).
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a ray of white light dispersed in a triangular prism. The speed of violet light in the prism in 1.88 ×...
(Solved)
The figure below shows a ray of white light dispersed in a triangular prism. The speed of violet light in the prism in 1.88 × 108m/s.
a) Explain how glass disperses white light into red and violet bands.
b) Determine the refractive index of the prism material for light (take speed of light in vacuum = 3×108m/s
c) Show on the figure the critical angle C for violet light and determine its value.
d) Given that r =21.5° determine the angle
e) On the same figure, sketch the part of red light after white light strikes the prism if the prism was replaced by another of
similar shape but lower refractive index. (Use a dotted line for the answer)
Date posted:
May 30, 2019
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Answers (1)