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They have low work function hence electrons can be ejected at low temperatures.
sharon kalunda answered the question on May 30, 2019 at 10:52
- The diagram in the figure 5.0 below shows an object O placed infront of a converging lens.
Using ray diagram determine the position of the image.(Solved)
The diagram in the figure 5.0 below shows an object O placed infront of a converging lens.
Using ray diagram determine the position of the image.
Date posted: May 30, 2019. Answers (1)
- State what happens to the depletion layer when
a) A diode is forward biased.
b) A diode is reverse biased.(Solved)
State what happens to the depletion layer when
a) A diode is forward biased.
b) A diode is reverse biased.
Date posted: May 30, 2019. Answers (1)
- The figure below shows the cloud chamber tracks of a certain radioactive emission.
State three properties of the radioactive emission producing the tracks shown in...(Solved)
The figure below shows the cloud chamber tracks of a certain radioactive emission.
State three properties of the radioactive emission producing the tracks shown in the figure above.
Date posted: May 30, 2019. Answers (1)
- Below is part of radioactive decay series of Uranium 238.
Identify isotopes from series above.(Solved)
Below is part of radioactive decay series of Uranium 238.
Identify isotopes from series above.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a coil and a magnet being removed from the coil.
a) State the polarity gained at end B.
b) Indicate the direction...(Solved)
The figure below shows a coil and a magnet being removed from the coil.
a) State the polarity gained at end B.
b) Indicate the direction of flow of current on the coil.
Date posted: May 30, 2019. Answers (1)
- A ray from a source X makes an angle of 30° with a plane reflector and a ray from a source Y makes an angle...(Solved)
A ray from a source X makes an angle of 30° with a plane reflector and a ray from a source Y makes an angle of 60° to the
same reflector at the same point M as shown below. Find the angle through which the reflector at the same point M as shown
below. Find the angle through which the reflector must be rotated about M such that the ray from the source Y falls on the
source X.
Date posted: May 30, 2019. Answers (1)
- A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take...(Solved)
A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take g = 10N/kg)
Date posted: May 30, 2019. Answers (1)
- The figure below represents a hydraulic brake.
A force of 20N is applied on the foot pedal connected to a piston of area 0.0005m² and this...(Solved)
The figure below represents a hydraulic brake.
A force of 20N is applied on the foot pedal connected to a piston of area 0.0005m² and this causes a stopping force of 5000N. Calculate
i) The pressure in the master cylinder.
ii) The area of the slave piston.
iii) The velocity ratio
Date posted: May 30, 2019. Answers (1)
- A driver driving a car of mass 1200kg at a constant speed of 72km/h is flagged down by a traffic police officer 145m
away. It takes...(Solved)
A driver driving a car of mass 1200kg at a constant speed of 72km/h is flagged down by a traffic police officer 145m
away. It takes him 2 seconds to react to the police signal and brings the car to rest by applying a constant breaking force in 10 seconds. Determine.
i) The minimum stopping distance.
ii) State whether it will hit the traffic police officer or not.
Date posted: May 30, 2019. Answers (1)
- A bus of mass 5,000kg and a car of mass 1200kg are both travelling on a dual carriage way at the same velocity. If both
drivers...(Solved)
A bus of mass 5,000kg and a car of mass 1200kg are both travelling on a dual carriage way at the same velocity. If both
drivers apply the same breaking force. State with reason which one will come to stop first.
Date posted: May 30, 2019. Answers (1)
- The weight of cube in air is 0.25N. When immersed in water, it weighs 0.44N and when in oil weighs 0.46N. Calculate the relative density...(Solved)
The weight of cube in air is 0.25N. When immersed in water, it weighs 0.44N and when in oil weighs 0.46N. Calculate the relative density of the oil.
Date posted: May 30, 2019. Answers (1)
- A block of glass of mass 0.25kg floats in mercury of density 1.36 × 104kg/m³. What volume of the glass lies under the surface of...(Solved)
A block of glass of mass 0.25kg floats in mercury of density 1.36 × 104kg/m³. What volume of the glass lies under the surface of mercury?
Date posted: May 30, 2019. Answers (1)
- A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower
surfaces are 80cm and 200cm below...(Solved)
A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower
surfaces are 80cm and 200cm below the surface of the liquid respectively.
i) What is the downward force on the top of the block?
ii) Calculate the upthrust on the block.
Date posted: May 30, 2019. Answers (1)
- A target of mass 1.05kg hangs from a tree by a long light string. An arrow of mass 100g is shot towards the target with...(Solved)
A target of mass 1.05kg hangs from a tree by a long light string. An arrow of mass 100g is shot towards the target with a
velocity of 10m/s and embeds itself in the target.
Determine:
i) the velocity of the target and the arrow just after collision.
ii) the maximum height reached by the target after the impact.
Date posted: May 30, 2019. Answers (1)
- A small metal sphere is released to fall through a long column of water held in a vertical tube. Explain why the sphere
finally acquires a...(Solved)
A small metal sphere is released to fall through a long column of water held in a vertical tube. Explain why the sphere
finally acquires a steady velocity.
Date posted: May 30, 2019. Answers (1)
- A student performed an experiment to study the relationship between pressure and volume of a gas enclosed in a vessel.
Temperature was kept constant throughout the...(Solved)
A student performed an experiment to study the relationship between pressure and volume of a gas enclosed in a vessel.
Temperature was kept constant throughout the experiment. The results obtained were plotted and the graph below obtained.
a) State the law of the student was investigating.
b) Given that p/v = R use your graph to obtain R.
Date posted: May 30, 2019. Answers (1)
- Water of mass 6kg initially at 25°C is heated in an electric kettle rated 6.0Kw. The water is heated until it boils at 100°C.
(Take specific...(Solved)
Water of mass 6kg initially at 25°C is heated in an electric kettle rated 6.0Kw. The water is heated until it boils at 100°C.
(Take specific heat capacity of water 4200J/kg/k, heat capacity of the kettle 450J/k, specific latent heat of vaporisation
of water = 2.3 × 106 J/kg)
Determine
i) Heat absorbed by the water.
ii) Heat absorbed by the electric kettle.
iii) Time taken for the water to boil.
iv) How much longer it will take to boil away all the water?
Date posted: May 30, 2019. Answers (1)
- A plane is inclined against a wall as shown in the figure below.
Calculate the Velocity Ratio of the inclined plane.(Solved)
A plane is inclined against a wall as shown in the figure below.
Calculate the Velocity Ratio of the inclined plane.
Date posted: May 30, 2019. Answers (1)
- Explain why it is necessary to add a little flour to the water when boiling it to cook ugali.(Solved)
Explain why it is necessary to add a little flour to the water when boiling it to cook ugali.
Date posted: May 30, 2019. Answers (1)
- Explain why a glass of water cools more when ice at 0°C is added to it than when equal mass of water at 0°C is...(Solved)
Explain why a glass of water cools more when ice at 0°C is added to it than when equal mass of water at 0°C is added to it.
Date posted: May 30, 2019. Answers (1)