Recent questions without a selected answer

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1 answer

What is biasing?

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

Using a diagram, explain how doping produces a p-type semi-conductor.

asked Aug 18, 2021 in Physics Form 4 by anonymous

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2 answers

Give any two uses of carbon IV oxide gas.

asked Aug 18, 2021 in Chemistry Form 2 by anony mous

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1 answer

The figure below shows features of a diffusion cloud chamber used for detecting radiations from a radioactive source.

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

A radioactive isotope showed a count rate of 82 counts per second initially. After a time of 210 seconds, the count rate dropped to 19 counts per second. The average background countremained constant at 10 counts per second. What is the half-life of the material?

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

Explain why Carbon -14(614C) is radioactive while Carbon – 12 (612C) is not.

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

A metal surface has a work function of 4.85eV. Calculate the maximum kinetic energy in joules of the electrons emitted when the metal is irradiated with uv light of frequency 1.75×1015Hz.

asked Aug 18, 2021 in Physics Form 1 by anonymous

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1 answer

The graph below shows stopping potential plotted against frequency, f.

asked Aug 18, 2021 in Physics Form 2 by anonymous

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1 answer

State any two factors that affect photoelectric effect.

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

What is meant by the term ‘photoelectric effect?’

asked Aug 18, 2021 in Physics Form 4 by anonymous

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1 answer

A form three student from Anestar High School used the set up drawn below in an attempt to prepare dry carbon IV oxide .Study it carefully and use it to answer the questions that follows.

asked Aug 18, 2021 in Chemistry Form 2 by anony mous

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1 answer

The figure below shows ray B1 incident through a glass block to air interface.

asked Aug 18, 2021 in Physics Form 1 by anonymous

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1 answer

A highly negatively charged rod is brought slowly towards the cap of a positively charged leaf electroscope. It is observed that the leaf initially collapses and then diverges. Explain the observations.

asked Aug 18, 2021 in Physics Form 1 by anonymous

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1 answer

Why is it advisable to obtain nitrogen from air instead ammonia?

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

In another experiment a gas jar containing ammonia was inverted over a burning splint. What observation would be made?

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

A man standing at the middle of two parallel walls fires a gun. He hears an echo after 1.5 seconds. Determine the distance of separation of the walls.

asked Aug 18, 2021 in Physics Form 1 by anonymous

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1 answer

The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

Polarization and local action are the common defects in a simple cell. How are these defects minimized in the cell?

asked Aug 18, 2021 in Physics Form 1 by anonymous

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1 answer

State with a reason which type of reflector would be preferred for:

asked Aug 18, 2021 in Physics Form 2 by anonymous

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1 answer

What is the ‘direction of the magnetic field’ at a point in the field?

asked Aug 18, 2021 in Physics Form 2 by anonymous

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