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0
votes
What property of lead makes it suitable for use as shielding material?
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
Figure 4 shows the features of an x-rays tube.
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
X-rays are used for detecting cracks inside metal beams.
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
The function of the capacitor is to eliminate sparking at the contacts. State why sparking occurs at the contacts.
answered
Aug 18, 2021
in
Physics Form 4
electromagnetic induction
0
votes
The figure below shows an induction coil used to step-up voltage.
answered
Aug 18, 2021
in
Physics Form 4
electromagnetic induction
0
votes
The figure below shows a section a flexible wire carrying current perpendicularly out of the paper.
answered
Aug 18, 2021
in
Physics Form 2
magnetism
0
votes
Study the circuit below:
answered
Aug 18, 2021
in
Physics
cells and simple circuits
0
votes
Arrange the following electromagnetic waves in order of their increasing wavelength. X-rays, gamma rays, ultra violet, visible light, infrared and microwaves.
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
The diagram below shows a circuit with a p-n junction and a very low power bulb.
answered
Aug 18, 2021
in
Physics Form 1
cells and simple circuits
0
votes
What is biasing?
answered
Aug 18, 2021
in
Physics Form 4
electronics
0
votes
Using a diagram, explain how doping produces a p-type semi-conductor.
answered
Aug 18, 2021
in
Physics Form 4
electronics
0
votes
The figure below shows features of a diffusion cloud chamber used for detecting radiations from a radioactive source.
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
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?
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
Explain why Carbon -14(614C) is radioactive while Carbon – 12 (612C) is not.
answered
Aug 18, 2021
in
Physics Form 4
radioactivity
0
votes
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.
answered
Aug 18, 2021
in
Physics Form 1
work energy power and machines
0
votes
The graph below shows stopping potential plotted against frequency, f.
answered
Aug 18, 2021
in
Physics Form 2
waves
0
votes
State any two factors that affect photoelectric effect.
answered
Aug 18, 2021
in
Physics Form 4
photoelectric effect
0
votes
What is meant by the term ‘photoelectric effect?’
answered
Aug 18, 2021
in
Physics Form 4
photoelectric effect
0
votes
The figure below shows ray B1 incident through a glass block to air interface.
answered
Aug 18, 2021
in
Physics Form 1
reflection at plane surface
0
votes
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.
answered
Aug 18, 2021
in
Physics Form 1
electrostatics
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