Class 12 CBSE Physics Dual Nature of Radiation and Matter Boards Questions
Here we provide Class 12 physics important notes,board questions and predicted questions with Answers for chapter Dual Nature of Radiation and Matter. These important notes,board questions and predicted questions are based on CBSE 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.
Class 12 CBSE Dual Nature of
Radiation and
Matter Boards Questions
Dual Nature of
Radiation and
Matter Boards Questions
2017
Q1
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
solutions
solutions
Q2
Using photon picture of light, show how Einstein’s photoelectric equation can be established. Write
two features of photoelectric effect which cannot be explained by wave theory.
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solutions
2018
Q3
Draw graphs showing variation of photoelectric current with applied voltage for two incident
radiations of equal frequency and different intensities. Mark the graph for the radiation of higher
intensity.
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solutions
Q4
If light of wavelength 412.5 nm is incident on each of the metals given below, which ones will show
photoelectric emission and why?
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solutions
2019
Q5
Define the term threshold frequency in the context of photoelectric emission
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solutions
Q6
Define the term intensity in photon picture of electromagnetic radiation.
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solutions
Q7
Plotting graph showing variation of de Broglie wavelength (λ) associated with a charged particle of
mass m vs 1/√V ,where V is the potential difference through which the particle is accelerated . How
does this graph give us the information regarding the magnitude of the charge of the particle ?
solutions
solutions
2020
Q8
Plotting graph showing variation of de Broglie wavelength (λ) associated with a charged particle of
mass m vs 1/√V ,where V is the potential difference through which the particle is accelerated . How
does this graph give us the information regarding the magnitude of the charge of the particle ?
solutions
solutions
Q9
Photons of energies 1 eV and 2 eV are successively incident on a metallic surface of work function
0·5 eV. The ratio of kinetic energy of most energetic photoelectrons in the two cases will be
(A) 1 : 2
(B) 1 : 1
(C) 1 : 3
(D) 1 : 4
solutions
(A) 1 : 2
(B) 1 : 1
(C) 1 : 3
(D) 1 : 4
solutions
Q10
A proton and an electron have equal speeds. Find the ratio of de Broglie wavelengths associated with
them.
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solutions
Q11
The variation of the stopping potential (Vo ) with the frequency (v) of the light incident on two
different photosensitive surfaces M1 and M2 is shown in the figure. Identify the surface which has
greater value of the work function
solutions
solutions
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