This is the emission of electrons from a surface when irradiated with radiation of sufficient frequency.
joseph rimiru answered the question on December 9, 2017 at 20:26
- The work function of a certain material is 3.5 eV. Determine the threshold frequency for the material. (1 electron volt eV = 1.6 x...(Solved)
The work function of a certain material is 3.5 eV. Determine the threshold frequency for the material. (1 electron volt eV = 1.6 x 10^-19 J, and plank’s constant h = 6.62 x10^-34 Js )
Date posted: December 9, 2017. Answers (1)
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The minimum frequency of radiation needed to cause photoelectric effect on a certain metal surface is 9.05 x 10^14 Hz. Determine the work function of the metal. (Plank’s constant h=6.63 x 10^-34 Js).
Date posted: December 9, 2017. Answers (1)
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Date posted: December 9, 2017. Answers (1)
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Date posted: December 9, 2017. Answers (1)
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Date posted: December 9, 2017. Answers (1)
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Date posted: December 7, 2017. Answers (1)
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Calculate the photon energy in ultra violet radiation whose frequency is 8.70 x 10^14 Hz. (Plank’s constant, h = 6.63 x 10^-34Js)
Date posted: December 7, 2017. Answers (1)
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The electrons are accelerated by a p.d. of 24000v in a given X-rays tube. Assuming all the energy goes to produce X-rays, determine the frequency of the X-rays produced. {Plank’s constant h= 6.62 x 10^-(34) Js and the charge on an electron e = 1.6 X10^(-19)C}
Date posted: December 7, 2017. Answers (1)
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State common systems of unit as used in environmental soil physics.
Date posted: December 7, 2017. Answers (1)
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Define soil water potential.
Date posted: December 7, 2017. Answers (1)
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A stone is thrown in water at a distance of 6 m from a bank and produces 12 crests of waves which took 10 minutes to reach the bank.
Find the frequency of the wave.
Date posted: December 6, 2017. Answers (1)
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Define the term soil water potential as used in physics.
Date posted: December 6, 2017. Answers (1)
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The X-rays are used for detecting cracks inside metal beams.
i. State the type of the x-rays used.
ii. Give a reason for the above answer.
Date posted: December 5, 2017. Answers (1)
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If one increases the E.H.T. in the X-ray tube, state and explain what will happen to the X-rays produced.
Date posted: December 5, 2017. Answers (1)
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Date posted: December 5, 2017. Answers (1)
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Date posted: December 5, 2017. Answers (1)
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Date posted: December 5, 2017. Answers (1)
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Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted: December 4, 2017. Answers (1)
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9. The follow table shows electric appliances to be used in a home. The electrical rating for each appliance is shown. The fuses available are 5A, 15A, 30A and 45 A
Appliance-----voltage(V)-----Power(w)
T.V.----------240----------300
Iron box------240----------720
Electrical kettle--240----2400
Determine which one of the fuses is suitable for the house.
Date posted: December 4, 2017. Answers (1)
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Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted: December 4, 2017. Answers (1)