Class 12 ISC Physics Photoelectric Effect Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Photoelectric Effect. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
class 12 ISC Physics Photoelectric Effect BoardQuestions
Photoelectric Effect BoardQuestions
Q1
In photoelectric effect experiment, the slope of the graph of the stopping potential versus frequency gives the value of :
(a) h/e
(b)h
(c) e/h
(d) hc/e
solutions
(a) h/e
(b)h
(c) e/h
(d) hc/e
solutions
Q2
Two metals A and B have work functions 4 eV and 6 eV respectively. Which metal has lower threshold wavelength for photoelectric effect?
solutions
solutions
Q3
Monochromatic light of wavelength 198 nm is incident on the surface of a metallic cathode whose work function is 2.5 eV. How much potential difference must be applied between the cathode and the anode of a photocell to just stop the photo current from flowing?
solutions
solutions
Q4
(i) Plot a labelled graph of |V5| where V5 is stopping potential versus frequency f of the incident radiation.
(ii) State how will you use this graph to determine the value of Planck’s constant.
solutions
(ii) State how will you use this graph to determine the value of Planck’s constant.
solutions
Q5
Define the following with reference to photoelectric effect:
(a) threshold frequency (f0)
(b) stopping potential (Vs)
solutions
The threshold frequency of incident radiation is the lowest frequency below which photoelectric emission is impossible, regardless of the intensity of the incident radiation.
The work function is that amount of energy which is required to get an electron out of the metal plate without any kinetic energy.
(a) threshold frequency (f0)
(b) stopping potential (Vs)
solutions
The threshold frequency of incident radiation is the lowest frequency below which photoelectric emission is impossible, regardless of the intensity of the incident radiation.
The work function is that amount of energy which is required to get an electron out of the metal plate without any kinetic energy.
The cut-off potential is defined as the minimum potential required to prevent an electron from escaping from a metal surface when the incident light's energy exceeds the work potential of the metal at which the incident light is focussed.
Q6
Einstein’s photoelectric equation is :
solutions
solutions
Q7
With reference to photoelectric effect, define threshold wavelength.
solutions
solutions
In the photoelectric effect, the threshold wave length is the minimum frequency or maximum wavelength of incident radiation required to liberate photons from a given surface.
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