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Use a ray diagram to show how short sightedness in a human eye can be corrected.
(Solved)
Use a ray diagram to show how short sightedness in a human eye can be corrected.
Date posted:
April 5, 2019
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Answers (1)
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Water of mass 200g at temperature of 60°Cis put in a well lagged copper calorimeter of mass
80g. A piece of ice at 0° C and...
(Solved)
Water of mass 200g at temperature of 60°Cis put in a well lagged copper calorimeter of mass
80g. A piece of ice at 0° C and mass 20g is placed in the calorimeter and the mixture stirred
gently until all the ice melts. The final temperature, T, of the mixture is then measured.
Determine:
i) The heat absorbed by the melting ice at O°C
ii) The heat absorbed by the melted ice (water) to rise to temperature T (answer may be
given in terms of T)
iii) The heat lost by the warm water and the calorimeter (answer may be given in terms of T)
iv) The final temperature of the mixture
Date posted:
April 5, 2019
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Answers (1)
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The figure below shows an object, O, placed in front of an objective lens Lo whose focal
length, ƒo is less than the focal length of...
(Solved)
The figure below shows an object, O, placed in front of an objective lens Lo whose focal
length, ƒo is less than the focal length of the eye piece lens; Le Complete using ray
construction how the arrangement would produce a compound. Microscope
Date posted:
April 5, 2019
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Answers (1)
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The barometric height at sea level is 76cm of mercury while at a point on a highland it is 74cm
of mercury. What is the altitude...
(Solved)
The barometric height at sea level is 76cm of mercury while at a point on a highland it is 74cm
of mercury. What is the altitude of the point? (Take g = 10m/s2 , density of mercury =
13600kg/m3 and density of air as 1.25kg/m3)
Date posted:
April 5, 2019
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Answers (1)
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An object of height 10cm is placed in front of a diverging lens of focal length 25 cm and at a
distance of 20 cm from...
(Solved)
An object of height 10cm is placed in front of a diverging lens of focal length 25 cm and at a
distance of 20 cm from the lens. Calculate the height of the image formed
Date posted:
April 5, 2019
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Answers (1)
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Define linear magnification of a lens.
(Solved)
Define linear magnification of a lens.
Date posted:
April 5, 2019
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Answers (1)
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The figure below shows to light pith balls arranged as shown.
State what is observed when air is blown on the outer sides of the pith...
(Solved)
The figure below shows to light pith balls arranged as shown.
State what is observed when air is blown on the outer sides of the pith balls.
Date posted:
April 5, 2019
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Answers (1)
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What does photoelectric effect suggest about the nature of light?
(Solved)
What does photoelectric effect suggest about the nature of light?
Date posted:
April 5, 2019
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Answers (1)
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A person’s lung pressure as recorded by a mercury manometer is 90 mm Hg. Express this
pressure in SI units.
(Solved)
A person’s lung pressure as recorded by a mercury manometer is 90 mm Hg. Express this
pressure in SI units.
Date posted:
April 5, 2019
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Answers (1)
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Figure below shows a mercury vapour lamp, which emits ultraviolet light held over a
negatively charged electroscope:
(Solved)
Figure below shows a mercury vapour lamp, which emits ultraviolet light held over a
negatively charged electroscope:
(i) What happens to the leaf after the lamp is switched on?
(ii) Explain why it happens
(iii) If the experiment is repeated with equally bright red light held the same distance from the
plate in place of the mercury vapour lamp, what effect would this have on the leaf?
Give a reason
Date posted:
April 5, 2019
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Answers (1)
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The graph below represents a graph of stopping potential Vs , V against frequency f, Hz
(Solved)
The graph below represents a graph of stopping potential Vs , V against frequency f, Hz
Use the graph to determine:
(i) The threshold frequency of the metal
(ii) Plank’s constant
(iii) Work function of the metal
Date posted:
April 5, 2019
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Answers (1)
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An object placed 15cm from a convex lens forms an image twice the size of the object.
Determine the focal length of the lens
(Solved)
An object placed 15cm from a convex lens forms an image twice the size of the object.
Determine the focal length of the lens
Date posted:
April 5, 2019
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Answers (1)
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The graph in the diagram in figure below shows the relationship between 1/u and 1/v for a converging lens where u and V are the...
(Solved)
The graph in the diagram in figure below shows the relationship between 1/u and 1/v for a converging lens where u and V are the object and image distances respectively.From the graph, determine the focal length f of the lens.
Date posted:
April 5, 2019
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Answers (1)
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A block of mass 5kg rests on an inclined surface as shown in the diagram below:
Determine the static friction on the block
(Solved)
A block of mass 5kg rests on an inclined surface as shown in the diagram below:
Determine the static friction on the block
Date posted:
April 5, 2019
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Answers (1)
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State and explain two features of a hydrometer that make it sensitive in its function
(Solved)
State and explain two features of a hydrometer that make it sensitive in its function
Date posted:
April 5, 2019
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Answers (1)
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The figure below shows a balloon carrying hydrogen gas 3m3 of density 0.09kgm-3. The mass
of the balloon fabric is 2kg and the density of air...
(Solved)
The figure below shows a balloon carrying hydrogen gas 3m3 of density 0.09kgm-3. The mass
of the balloon fabric is 2kg and the density of air is 1.25kgm-3
i) Determine the tension in the string
ii) If the string is suddenly cut, calculate the acceleration of the balloon upwards
iii) What is the maximum mass of the equipment the balloon can lift at a constant velocity
Date posted:
April 5, 2019
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Answers (1)
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A measuring cylinder contains 50cm3 of light oil at 0oC. When a lump of dried ice is placed in
the oil, the total volume is 72cm3....
(Solved)
A measuring cylinder contains 50cm3 of light oil at 0oC. When a lump of dried ice is placed in
the oil, the total volume is 72cm3. Determine the density of the ice.
Date posted:
April 5, 2019
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Answers (1)
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A piece of metal N of mass 2kg weighs 18N in water and 12N in liquid M. Determine the density
of ;
(i) The metal N
(ii) The...
(Solved)
A piece of metal N of mass 2kg weighs 18N in water and 12N in liquid M. Determine the density
of ;
(i) The metal N
(ii) The liquid M
Date posted:
April 5, 2019
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Answers (1)
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A bathroom shower has 200 holes each 2.5mm2 in area. Water flows from a pipe of cross-section
area of 15cm2 at 5m/s to the shower. Determine...
(Solved)
A bathroom shower has 200 holes each 2.5mm2 in area. Water flows from a pipe of cross-section
area of 15cm2 at 5m/s to the shower. Determine the speed of the spray.
Date posted:
April 5, 2019
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Answers (1)
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A ship of mass 1300 tonnes floats on sea water:
(i) What volume of sea water is displaced (Density of sea water is 1025kg/m3)
(ii) Suppose it...
(Solved)
A ship of mass 1300 tonnes floats on sea water:
(i) What volume of sea water is displaced (Density of sea water is 1025kg/m3)
(ii) Suppose it sails from sea water to fresh water, what cargo must be removed so that
the same volume of water is displaced? (Density of fresh water = 1000kg/m3
Date posted:
April 5, 2019
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Answers (1)