Hard magnetic materials. Are those materials which are difficulty to magnetize but once magnetized they retain their magnetism for longer time.
Soft magnetic materials. Are those materials which are magnetized easily but do not retain their magnetism for longer time.
Moraa orina answered the question on April 18, 2018 at 03:29
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Describe the methods of magnetizing a magnetic material.
(Solved)
Describe the methods of magnetizing a magnetic material.
Date posted:
April 18, 2018
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Answers (1)
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List the properties of magnets
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List the properties of magnets
Date posted:
April 16, 2018
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Answers (1)
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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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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.
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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.
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)
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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 ?=3.0x108m/s)
Date posted:
April 12, 2018
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Answers (1)
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State the uses of X-Rays
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State the uses of X-Rays.
Date posted:
April 12, 2018
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Explain how X-Rays are produced
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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)