Questions by anonymous

0 votes

1 answer

Figure 4 shows the features of an x-rays tube.

asked Aug 18, 2021 in Physics Form 4

0 votes

2 answers

X-rays are used for detecting cracks inside metal beams.

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

The function of the capacitor is to eliminate sparking at the contacts. State why sparking occurs at the contacts.

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

The figure below shows an induction coil used to step-up voltage.

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

The figure below shows a section a flexible wire carrying current perpendicularly out of the paper.

asked Aug 18, 2021 in Physics Form 2

0 votes

1 answer

Study the circuit below:

asked Aug 18, 2021 in Physics

0 votes

1 answer

Arrange the following electromagnetic waves in order of their increasing wavelength. X-rays, gamma rays, ultra violet, visible light, infrared and microwaves.

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

The diagram below shows a circuit with a p-n junction and a very low power bulb.

asked Aug 18, 2021 in Physics Form 1

0 votes

1 answer

What is biasing?

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

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

asked Aug 18, 2021 in Physics Form 4

0 votes

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

0 votes

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

0 votes

1 answer

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

asked Aug 18, 2021 in Physics Form 4

0 votes

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

0 votes

1 answer

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

asked Aug 18, 2021 in Physics Form 2

0 votes

1 answer

State any two factors that affect photoelectric effect.

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

What is meant by the term ‘photoelectric effect?’

asked Aug 18, 2021 in Physics Form 4

0 votes

1 answer

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

asked Aug 18, 2021 in Physics Form 1

0 votes

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

0 votes

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

Page:

« prev
1
...
21
22
23
24
25
26
27
...
118
next »

...