Get premium membership and access questions with answers, video lessons as well as revision papers.
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)
- 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...(Solved)
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)
- How many milligram in one kilogram?(Solved)
How many milligram in one kilogram?
Date posted: December 9, 2017. Answers (1)
- State the advantages of lead acid accumulator over primary cell(Solved)
Advantages of lead acid accumulator over primary cell
Date posted: December 9, 2017. Answers (1)
- Give the applications of reflection of sound (Solved)
Give the applications of reflection of sound.
Date posted: December 9, 2017. Answers (1)
- The surface of a metal was struck by a light of certain wavelength. State what determine the maximum kinetic energy of the electron emitted.(Solved)
The surface of a metal was struck by a light of certain wavelength. State what determine the maximum kinetic energy of the electron emitted.
Date posted: December 7, 2017. Answers (1)
- 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)(Solved)
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)
- 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...(Solved)
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)
- State common systems of unit as used in environmental soil physics(Solved)
State common systems of unit as used in environmental soil physics.
Date posted: December 7, 2017. Answers (1)
- Define soil water potential(Solved)
Define soil water potential.
Date posted: December 7, 2017. Answers (1)
- 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...(Solved)
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)
- Define the term soil water potential as used in physics(Solved)
Define the term soil water potential as used in physics.
Date posted: December 6, 2017. Answers (1)
- 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.(Solved)
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)
- If one increases the E.H.T. in the X-ray tube, state and explain what will happen to the X-rays produced.(Solved)
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)
- How do you convert binary number to BCD.(Solved)
How do you convert binary number to BCD.
Date posted: December 5, 2017. Answers (1)
- How do you convert Binary Coded Decimal(BCD) to binary(Solved)
How do you convert Binary Coded Decimal(BCD) to binary.
Date posted: December 5, 2017. Answers (1)
- Briefly explain why rooms are at a lower level and ventilators at a higher level
(Solved)
Briefly explain why rooms are at a lower level and ventilators at a higher level
Date posted: December 5, 2017. Answers (1)
- Give the two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO).(Solved)
Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted: December 4, 2017. Answers (1)
- 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,...(Solved)
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)
- Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason. (Solved)
Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted: December 4, 2017. Answers (1)