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प्रश्न
Write the three salient features observed in photoelectric effect which can be explained using this equation.
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उत्तर
Salient features observed in photoelectric effect: —
•The stopping potential and hence the maximum kinetic energy of emitted electrons varies linearly with the frequency of incident radiation.
• There exists a minimum cut − off frequency v0, for which the stopping potential is zero.
• Photoelectric emission is instantaneous.
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संबंधित प्रश्न
Define the term ‘stopping potential’ in relation to photo-electric effect.
Cathode rays constitute a stream of _______________ .
Cathode rays are passing through a discharge tube. In the tube, there is ______________ .
Which of the following is true for a cathode ray?
(a) It travels in a straight line.
(b) It emits an X-ray when it strikes a metal.
(c) It is an electromagnetic wave.
(d) It is not deflected by a magnetic field.
The saturation current in a triode valve can be changed by changing _____________ .
Two discharge tubes have identical material structures and the same gas is filled in them. The length of one tube is 10 cm and that of the other tube is 20 cm. Sparking starts in both the tubes when the potential difference between the cathode and the anode is 100 V. If the pressure in the shorter tube is 1.0 mm of mercury, what is the pressure in the longer tube?
On what factor does the maximum kinetic energy of the photoelectrons in a photo cell depend?
Which of the following proves particle nature of light?
Assertion A: The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal.
Reason R: Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.
The electric field at a point associated with a light wave is given by
E = 200[sin(6 × 1015)t + sin(9 × 1015)t]Vm-1
Given: h = 4.14 × 10-15 eVs.
If this light falls on a metal surface having a work function of 2.50eV, the maximum kinetic energy of the photoelectrons will be ______.
