Class 12PhysicsDual Nature of Radiation and MatterPhotoelectric Effect by Lenard and it's Observations
MediumWrite the characteristics of the photoelectric effect.
(N/A) $(i)$ For a given photosensitive substance, when the frequency of incident radiation is greater than the threshold frequency, the photoelectric current is directly proportional to the intensity of light.
$(ii)$ For a given photosensitive substance and frequency of incident radiation, the saturation current is proportional to the intensity of radiation, but the stopping potential is independent of the intensity.
$(iii)$ For a given photosensitive substance, if the frequency is less than the threshold frequency, photoelectric emission will not take place, regardless of the intensity of radiation.
$(iv)$ For a frequency greater than the threshold frequency $(v > v_{0})$, the stopping potential and maximum kinetic energy vary linearly with the frequency of the incident radiation, but they do not depend on the intensity of the radiation.
$(v)$ Photoelectric emission is an instantaneous process, occurring within a time interval of $10^{-9} \,s$ or less.
$(ii)$ For a given photosensitive substance and frequency of incident radiation, the saturation current is proportional to the intensity of radiation, but the stopping potential is independent of the intensity.
$(iii)$ For a given photosensitive substance, if the frequency is less than the threshold frequency, photoelectric emission will not take place, regardless of the intensity of radiation.
$(iv)$ For a frequency greater than the threshold frequency $(v > v_{0})$, the stopping potential and maximum kinetic energy vary linearly with the frequency of the incident radiation, but they do not depend on the intensity of the radiation.
$(v)$ Photoelectric emission is an instantaneous process, occurring within a time interval of $10^{-9} \,s$ or less.
Explore More
Similar Questions
The graph given in the figure shows the variation of photocurrent $(I)$ with the applied voltage $(V)$ for two different materials and for two different intensities of incident radiation. Which of the following pairs of curves represent the same material?
Assertion: The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.
Reason: The work function of the metal is its characteristic property.
Reason: The work function of the metal is its characteristic property.
MediumAIIMS 2017
View SolutionThe electrons are emitted in the photoelectric effect from a metal surface:
Easy
View SolutionConsider the two following statements $A$ and $B$, and identify the correct choice given in the answers :
$(A)$ In photovoltaic cells, the photoelectric current produced is not proportional to the intensity of incident light.
$(B)$ In gas-filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.
$(A)$ In photovoltaic cells, the photoelectric current produced is not proportional to the intensity of incident light.
$(B)$ In gas-filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.
One milliwatt of light of wavelength $4560 \ \mathring{A}$ is incident on a cesium surface of work function $1.9 \ eV$. Given that the quantum efficiency of photoelectric emission is $0.5\%$. Planck's constant $h = 6.62 \times 10^{-34} \ J \cdot s$,velocity of light $c = 3 \times 10^8 \ m/s$,the corresponding photoelectric current is:
Difficult
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo