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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
- 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. Answers (1)
- Consider the table below for electromagnetic waves.
Fill in the spaces labelled A, B, C & D(Solved)
Consider the table below for electromagnetic waves.
Fill in the spaces labelled A, B, C & D
Date posted: May 30, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- Figure below shows a modern mains appliance.
i) State the purpose of lead E.
ii) Explain why the fuse is connected to the live wire.(Solved)
Figure below shows a modern mains appliance.
i) State the purpose of lead E.
ii) Explain why the fuse is connected to the live wire.
Date posted: May 30, 2019. Answers (1)
- 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. Answers (1)
- i)The figure below shows an object 'O' in front of a lens.
By drawing appropriate rays, on the same figure, state the position of the image...(Solved)
i)The figure below shows an object 'O' in front of a lens.
By drawing appropriate rays, on the same figure, state the position of the image formed.
ii) Explain the adjustment you would make on the position of the object above in order to obtain a real magnified image.
Date posted: May 30, 2019. Answers (1)
- When does a convex lens form a virtual image?.(Solved)
When does a convex lens form a virtual image?.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a waver profile for a wave whose frequency is 2HZ
Determine the value of t3(s)(Solved)
The figure below shows a waver profile for a wave whose frequency is 2HZ
Determine the value of t3(s)
Date posted: May 30, 2019. Answers (1)
- Sound is a longitudinal pressure wave. Explain this statement.(Solved)
Sound is a longitudinal pressure wave. Explain this statement.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a conducting carrying current placed in the magnetic field and moves in the direction shown
Identify the polarities X and Y.(Solved)
The figure below shows a conducting carrying current placed in the magnetic field and moves in the direction shown
Identify the polarities X and Y.
Date posted: May 30, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer...(Solved)
Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer correct to two decimal places.
Date posted: May 30, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph...(Solved)
The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph to determine:
i) the maximum speed of the train.
ii) The acceleration of the train during the first 2mins of the journey.
iii) The time during which the train is slowing down.
iv) The total distance, in metres, between the two stations.
v) The average speed in m/s of the train.
Date posted: May 30, 2019. Answers (1)
- 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. Answers (1)
- A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.(Solved)
A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.
Date posted: May 30, 2019. Answers (1)
- A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.(Solved)
A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.
Date posted: May 30, 2019. Answers (1)