1. They are double poled substances with both the North and South poles.
2. Like poles repel and unlike poles attract. Repulsion is a sure method of determining
whether two substances are magnets.
3. The greatest magnetic force is concentrated around the poles of a magnet.
Moraa orina answered the question on April 16, 2018 at 15:35
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State the applications of radioactivity
(Solved)
State the applications of radioactivity
Date posted:
April 12, 2018
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Answers (1)
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A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.
(Solved)
A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.
Date posted:
April 12, 2018
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Answers (1)
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A radioactive substance is found to have an activity of 360 counts per second. 5minutes later, it was 45counts per second. Determine its half life.
(Solved)
A radioactive substance is found to have an activity of 360 counts per second. 5 minutes later, it was 45 counts per second. Determine its half life.
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of gamma radiation
(Solved)
State the characteristics of gamma radiation
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of beta radiation
(Solved)
State the characteristics of beta radiation
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of alpha radiation
(Solved)
State the characteristics of alpha radiation
Date posted:
April 12, 2018
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Answers (1)
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What are the applications of photoelectric effect?
(Solved)
What are the applications of photoelectric effect?
Date posted:
April 12, 2018
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Answers (1)
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The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum...
(Solved)
The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum speed with which a photoelectron is emitted if the frequency of the radiation is 7.5x1014Hz.
Date posted:
April 12, 2018
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Answers (1)
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Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.
(Solved)
Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.
Date posted:
April 12, 2018
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Answers (1)
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State any differences between x-rays and cathode rays.
(Solved)
State any differences between x-rays and cathode rays.
Date posted:
April 12, 2018
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Answers (1)
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An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.
(Solved)
An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.
Date posted:
April 12, 2018
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Answers (1)
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Calculate the energy of x-rays whose frequency is 3x1016Hz.(Take h=6.63x10-9Js, e=1.6x10-19C, me=9.11x10-6kg and v=3.0x108m/s)
(Solved)
Calculate the energy of x-rays whose frequency is 3x1016Hz.(Take h=6.63x10-9Js, e=1.6x10-19C, me=9.11x10-6kg and ?=3.0x108m/s)
Date posted:
April 12, 2018
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Answers (1)
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State the uses of X-Rays
(Solved)
State the uses of X-Rays.
Date posted:
April 12, 2018
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Answers (1)
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Explain how X-Rays are produced
(Solved)
Explain how X-Rays are produced
Date posted:
April 12, 2018
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Answers (1)
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State the uses of the Cathode Ray Oscilloscope (CRO)
(Solved)
State the uses of the Cathode Ray Oscilloscope (CRO)
Date posted:
April 12, 2018
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Answers (1)
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State the components of a cathode ray oscilloscope
(Solved)
State the components of a cathode ray oscilloscope
Date posted:
April 12, 2018
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Answers (1)
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An electric cooker has an oven rated 3 kW, a grill rated 2 kW and two rings each rated 500 W. The cooker operates from a 240V...
(Solved)
An electric cooker has an oven rated 3 kW, a grill rated 2 kW and two rings each rated 500 W. The cooker
operates from a 24 0V mains. What is the cost of operating all the parts for 5 minutes if electricity costs Sh 1.50 per unit?
Date posted:
April 11, 2018
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Answers (1)
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A six bulb arrangement in a house runs for 8 hours every night for 5 days. If each bulb is rated 100 W and the cost of...
(Solved)
A six bulb arrangement in a house runs for 8 hours every night for 5 days. If each bulb is rated 100 W and the cost of electrical energy is sh. 2.60 per unit, how much will the owner of the house pay at the end of the five days?
Date posted:
April 11, 2018
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Answers (1)
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An electric cooker has an oven rated 3kW, a grill rated 2kW and two rings each rated 500W. The cooker operates from 240V...
(Solved)
An electric cooker has an oven rated 3kW, a grill rated 2kW and two rings each rated 500W. The cooker
operates from 240V mains. Would a 5A fuse be suitable for the cooker assuming that all the parts are switched
on?
Date posted:
April 11, 2018
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Answers (1)
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A power station produces 50kW at 240V. The power is transmitted through cables with a resistance of 0.4?. Calculate the percentage power loss during...
(Solved)
A power station produces 50kW at 240V. The power is transmitted through cables with a resistance of
0.4?. Calculate the percentage power loss during transmission.
Date posted:
April 11, 2018
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Answers (1)