Photoelectric effect is the emission of electrons from a surface when radiated with radiations of sufficient frequency.
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Photoelectric effect is a phenomenon in which electrons are emitted from the surface of a substance when certain electromagnetic radiation falls on it.
johnmulu answered the question on February 21, 2017 at 12:25
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The work function of a certain material is 3.2 eV. Determine the threshold frequency for the material. (1 electron Volt(eV) = 1.6 x 10-19 J and planks Constant h = 6.62 x 10-34Js)
(Solved)
The work function of a certain material is 3.2 eV. Determine the threshold frequency for the material. (1 electron Volt(eV) = 1.6 x 10-19 J and planks Constant h = 6.62 x 10-34Js)
Date posted:
February 21, 2017
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Answers (1)
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The minimum frequency of radiation necessary to cause photoelectric effect on a certain metal surface in 9.06 x 1014Hz. Determine the work function of the metal.
(Solved)
The minimum frequency of radiation necessary to cause photoelectric effect on a certain metal surface in 9.06 x 1014Hz. Determine the work function of the metal. (Plank constant h = 6.63 x 10-19Js)
Date posted:
February 21, 2017
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Answers (1)
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Light of a certain wavelength strikes the surface of a metal. State what determines the maximum kinetic energy of the electron emmitted.
(Solved)
Light of a certain wavelength strikes the surface of a metal. State what determines the maximum kinetic energy of the electron emmitted.
Date posted:
February 20, 2017
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Answers (1)
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It is observed that when ultraviolet light is shone onto a clean zinc plate connected to the cap of negatively charged leaf electroscope, the leaf collapses
(Solved)
It is observed that when ultraviolet light is shone onto a clean zinc plate connected to the cap of negatively charged leaf electroscope, the leaf collapses. Explain this observation
Date posted:
February 20, 2017
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Answers (1)
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The anode of an x-ray tube becomes hot when the tube is in use. State the reason for this.
(Solved)
The anode of an x-ray tube becomes hot when the tube is in use. State the reason for this.
Date posted:
February 20, 2017
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Answers (1)
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An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays
(Solved)
An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays
Date posted:
February 20, 2017
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Answers (1)
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An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays.
(Solved)
An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays.
Date posted:
February 20, 2017
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Answers (1)
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In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased.
(Solved)
In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased. Explain this observation
Date posted:
February 20, 2017
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Answers (1)
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The accelerating potential of a certain X-ray tube is increased. State the change observed on the X-rays produced.
(Solved)
The accelerating potential of a certain X-ray tube is increased. State the change observed on the X-rays produced.
Date posted:
February 20, 2017
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Answers (1)
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State the reason and the effect on the X-rays produced in an X-ray tube, when the p.d across the tube is increased.
(Solved)
State the reason the effect on the X-rays produced in an X-ray tube, when the p.d across the tube is increased.
Date posted:
February 20, 2017
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Answers (1)
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The target of X-ray tube is made of metals of high melting point,give reason
(Solved)
The target of X-ray tube is made of metals of high melting point. Give a reason for this
Date posted:
February 20, 2017
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Answers (1)
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State the differences between hard X-ray and soft X-rays
(Solved)
State the differences between hard X-ray and soft X-rays.
Date posted:
February 20, 2017
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Answers (1)
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Give a reason why the target in an X-ray tube is made of tungesten or molybdenum.
(Solved)
Give a reason why the target in an X-ray tube is made of tungesten or molybdenum.
Date posted:
February 20, 2017
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Answers (1)
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Give a reason why the target in an X-rays makes it possible to detect cracks in bones
(Solved)
Give a reason why the target in an X-rays makes it possible to detect cracks in bones
Date posted:
February 20, 2017
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Answers (1)
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State the factor that determines the hardness of the X-rays produced in an X-ray tube.
(Solved)
State the factor that determines the hardness of the X-rays produced in an X-ray tube.
Date posted:
February 20, 2017
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Answers (1)
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State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
(Solved)
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
Date posted:
February 20, 2017
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Answers (1)
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State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.
(Solved)
State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.
Date posted:
February 20, 2017
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Answers (1)
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State one industrial use of X-rays
(Solved)
State one industrial use of X-rays
Date posted:
February 20, 2017
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Answers (1)
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Name the metal used to shields X-rays operators from the radiation
(Solved)
Name the metal used to shields X-rays operators from the radiation. Give a reason why it is used.
Date posted:
February 20, 2017
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Answers (1)
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Name two differences between cathode rays and electromagnetic radiations.
(Solved)
Name two differences between cathode rays and electromagnetic radiations.
Date posted:
February 20, 2017
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Answers (1)