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Prevents the column of mercury beyond the constriction from going back to the mercury bulb hence allowing reading at one’s own convenience.
marto answered the question on November 13, 2019 at 11:34
- n an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.12cm3 was placed on a clean...(Solved)
In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.12cm3 was placed on a clean water surface. The oil spread on a patch of
diameter 6.0 x 106 mm2.
a) Calculate the size of the molecule.
b) State an assumption made in the above calculations.
Date posted: November 13, 2019. Answers (1)
- The diagram below shows the behaviour of mercury in a capillary tube.(Solved)
The diagram below shows the behaviour of mercury in a capillary tube.
Explain the behaviour.
Date posted: November 13, 2019. Answers (1)
- The figure below shows a vernier calipers scale.(Solved)
The figure below shows a vernier calipers scale.
State the correct reading of scale if the instrument has a zero-error of -0.02cm
Date posted: November 13, 2019. Answers (1)
- student obtained ice at 0 degrees C from a refrigerator and placed it in a beaker on a bench. After 4 minutes, the temperature rose...(Solved)
student obtained ice at 0 degrees Cfrom a refrigerator and placed it in a beaker on a bench. After 4 minutes, the temperature rose to 4 degrees C. State the changes that would be observed in the water in terms of;
(i) density
(ii) mass
(ii) volume
Date posted: November 7, 2019. Answers (1)
- A certain metal is illuminated with radiation of different frequencies and corresponding stopping potential determined. The graph in figure below shows how the stopping potential...(Solved)
A certain metal is illuminated with radiation of different frequencies and corresponding stopping potential determined. The graph in figure below shows how the stopping potential vary with frequency. Electronic charge, e =1.6x10-19C
Using the graph determine
i) Planks constant.
ii) Work function of the metal
Date posted: November 4, 2019. Answers (1)
- The minimum frequency of light that causes photoelectric emission from a metal surface is 6.4 x 1014Hz . When the surface is irradiated with a...(Solved)
The minimum frequency of light that causes photoelectric emission from a metal surface is 6.4 x 1014Hz . When the surface is irradiated with a certain source , electrons are dislodged With a speed of 7.2 x 105m/s.Given that h = 6.63 x 10-34Js and m = 9.11 x 10-31kg , calculate
i) The work function of the metal
ii) The maximum kinetic energy of the photoelectrons
Date posted: November 4, 2019. Answers (1)
- Draw the electric field pattern between the positive point charge and the negatively charged plate in figure below.(Solved)
Draw the electric field pattern between the positive point charge and the negatively charged plate in figure below.
Date posted: November 4, 2019. Answers (1)
- You are provided with three capacitors with capacitance 2µf, 5µf and 3µf .
i) Sketch a diagram showing how the three capacitors can be connected to...(Solved)
You are provided with three capacitors with capacitance 2µf, 5µf and 3µf .
i) Sketch a diagram showing how the three capacitors can be connected to produce
maximum capacitance.
ii) Determine the maximum capacitance.
iii) The arrangement in (i) above is connected in series with a 12V battery.
Calculate the work done in charging the capacitors.
Date posted: November 4, 2019. Answers (1)
- Draw labeled diagram of a simple a.c generator.(Solved)
Draw labeled diagram of a simple a.c generator.
Date posted: November 4, 2019. Answers (1)
- In an experiment to determine the focal length of a concave mirror, magnification M was determined for various image distance V. The figure below shows...(Solved)
In an experiment to determine the focal length of a concave mirror, magnification M was determined for various image distance V. The figure below shows a graph of magnification M against image distance V for the results from the experiment.
Use the graph to determine:
i) The focal length ,f of the mirror, given that M= 1 - v/f
ii) The image distance when the magnification is 0.6.
Date posted: November 4, 2019. Answers (1)
- An upright object is placed in front of a converging (convex lens). An image magnified 3 times was formed on the screen. If the distance...(Solved)
An upright object is placed in front of a converging (convex lens). An image magnified 3 times was formed on the screen. If the distance between the object and the screen was 80cm, determine:-
i) The object distance.
ii) The focal length of the lens.
Date posted: November 4, 2019. Answers (1)
- State what happens to the wavelength of a water wave when it moves from shallow to deep water.(Solved)
State what happens to the wavelength of a water wave when it moves from shallow to deep water.
Date posted: November 4, 2019. Answers (1)
- Draw a circuit diagram showing how a single diode can be used in half wave rectification.(Solved)
Draw a circuit diagram showing how a single diode can be used in half wave rectification.
Date posted: November 4, 2019. Answers (1)
- The figure below shows a ray of light transversing from a glass medium to air.
Determine the refractive index of glass.(Solved)
The figure below shows a ray of light transversing from a glass medium to air.
Determine the refractive index of glass.
Date posted: November 4, 2019. Answers (1)
- Illustrate by means of diagram what is meant by diffraction.(Solved)
Illustrate by means of diagram what is meant by diffraction.
Date posted: November 4, 2019. Answers (1)
- Figure below shows resistors connected in an electric circuit.
Determine the reading of the ammeter.(Solved)
Figure below shows resistors connected in an electric circuit.
Determine the reading of the ammeter.
Date posted: November 4, 2019. Answers (1)
- The figure below shows a wire wound round a soft iron core. A copper cube ,R, is placed just
below end Q.
i) Identify poles P and...(Solved)
The figure below shows a wire wound round a soft iron core. A copper cube ,R, is placed just
below end Q.
i) Identify poles P and Q when switch S is closed.
ii) State and explain what happens to copper cube R when switch S is closed.
Date posted: November 4, 2019. Answers (1)
- Below is a nuclear reaction equation.
Determine the values X and Y(Solved)
Below is a nuclear reaction equation.
Determine the values X and Y
Date posted: November 4, 2019. Answers (1)
- A pinhole camera is designed with many pinholes. State and explain what is observed on the image when the number of pinholes is decreased.(Solved)
A pinhole camera is designed with many pinholes. State and explain what is observed on the image when the number of pinholes is decreased.
Date posted: November 4, 2019. Answers (1)
- The table below shows radiations in their decreasing order of energy.
Identify radiation labeled Q(Solved)
The table below shows radiations in their decreasing order of energy.
Identify radiation labeled Q
Date posted: November 4, 2019. Answers (1)