When light falls on the cap of the electroscope some electrons are dislodged from the surface leaving a net positive charge on the electroscope. Hence the rod and leaf repel and leaf rises
johnmulu answered the question on February 21, 2017 at 13:13
-
A photo of ultraviolet light having energy E falls on a photo emissive surface whose work function is T. Write an expression for maximum kinetic energy of the resulting photoelectron in terms of E and T.
(Solved)
A photo of ultraviolet light having energy E falls on a photo emissive surface whose work function is T. Write an expression for maximum kinetic energy of the resulting photoelectron in terms of E and T.
Date posted:
February 21, 2017
.
Answers (1)
-
Light of frequency 7.5 x 1014Hz strikes a metal surface whose work function is 4.0 x 10-19 J. Determine the kinetic energy of the emitted photoelectrons.
(Solved)
Light of frequency 7.5 x 1014Hz strikes a metal surface whose work function is 4.0 x 10-19 J. Determine the kinetic energy of the emitted photoelectrons. (take planks constant h = 6.63 x 10-34Js)
Date posted:
February 21, 2017
.
Answers (1)
-
Define the term "threshold frequency" as used in photo electric emission.
(Solved)
State the meaning of the term "threshold frequency" as used in photo electric emission.
Date posted:
February 21, 2017
.
Answers (1)
-
What is meant by stopping potential?
(Solved)
What is meant by stopping potential?
Date posted:
February 21, 2017
.
Answers (1)
-
State the property of radiation that determines the number of electrons emitted when a radiation falls on a metal surface.
(Solved)
State the property of radiation that determines the number of electrons emitted when a radiation falls on a metal surface.
Date posted:
February 21, 2017
.
Answers (1)
-
If the frequency of the illuminating radiation is just equal to the threshold frequency of the surface explain why no photoelectric effect is observed .
(Solved)
If the frequency of the illuminating radiation is just equal to the threshold frequency of the surface explain why no photoelectric effect is observed .
Date posted:
February 21, 2017
.
Answers (1)
-
What is meant by the term work function?
(Solved)
What is meant by the term work function?
Date posted:
February 21, 2017
.
Answers (1)
-
Explain how an "excited" hydrogen atom is able to emit radiations of different wavelengths
(Solved)
Explain how an "excited" hydrogen atom is able to emit radiations of different wavelengths
Date posted:
February 21, 2017
.
Answers (1)
-
What is photoelectric effect?
(Solved)
What is photoelectric effect?
Date posted:
February 21, 2017
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)