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- State a reason why a closed tube or pipe produces less quality sound than an open one.(Solved)
State a reason why a closed tube or pipe produces less quality sound than an open one.
Date posted: April 5, 2019. Answers (1)
- 500g of a metal is heated to 100oC and then placed in a 200g mass of water at 15oC. If the final temperature rises to...(Solved)
500g of a metal is heated to 100oC and then placed in a 200g mass of water at 15oC. If the final temperature rises to 21oC, calculate the specific heat capacity of the metal.
(Specific heat capacity of water = 4200J/kg
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)
- Figure 2 shows an object O placed in front of a concave ion with principal foci F and F1.
Construct a ray diagram to locate the...(Solved)
Figure 2 shows an object O placed in front of a concave ion with principal foci F and F1.
Construct a ray diagram to locate the position of the image
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)
- A thin converging lens of focal length 30cm is used to form a real image on a screen 90cm
from the lens, Determine :-(Solved)
A thin converging lens of focal length 30cm is used to form a real image on a screen 90cm
from the lens, Determine :-
(i) The object distance
(ii) The magnification
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- Define linear magnification of a lens.(Solved)
Define linear magnification of a lens.
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The figure 7 below shows two blocks of masses M1=1.5kg and M2 = 2.0kg which are in
contact on a frictionless table
A force F=7N acts on...(Solved)
The figure 7 below shows two blocks of masses M1=1.5kg and M2 = 2.0kg which are in
contact on a frictionless table
A force F=7N acts on the bodies, determine the force on mass M2
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- A nail is placed 25cm from the objective lens of focal length 15cm. On the other side of the
objective lens another converging lens of focal...(Solved)
A nail is placed 25cm from the objective lens of focal length 15cm. On the other side of the
objective lens another converging lens of focal length 30cm is placed as the eyepiece. The
distance between the two lenses is 52.5cm
Find: (i) the position of the first image
(ii) the position of the final image from the eye piece lens
Date posted: April 5, 2019. Answers (1)
- 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. Answers (1)