Dual Nature of Radiation and Matter
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Photoelectric Effect
SubtopicPhotoelectric Effect under Dual Nature of Radiation and Matter for Grade 12 ICSE.
Preview questions (no answers)
- 1.
The experimental observation of the photoelectric effect was primarily responsible for confirming which nature of light?
A.Wave nature
B.Transverse nature
C.Longitudinal nature
D.Particle nature
- 2.
In a photoelectric experiment, if the intensity of incident light is increased while keeping the frequency constant (and above the threshold), the photoelectric current:
A.Increases linearly
B.Decreases linearly
C.Remains constant
D.Becomes zero
- 3.
According to Einstein's photoelectric equation, the maximum kinetic energy of emitted photoelectrons depends linearly on the:
A.Intensity of incident radiation
B.Frequency of incident radiation
C.Square of the wavelength
D.Time of exposure to radiation
Download the worksheet for Dual Nature of Radiation and Matter - Photoelectric Effect to practice offline. It includes additional chapter-level practice questions.
Einstein’s Photoelectric Equation
SubtopicEinstein’s Photoelectric Equation under Dual Nature of Radiation and Matter for Grade 12 ICSE.
Preview questions (no answers)
- 1.
In the graph showing the variation of stopping potential () with the frequency () of incident radiation, the intercept on the frequency axis represents:
A.Planck's constant
B.The work function
C.The threshold frequency
D.The stopping potential
- 2.
If the intensity of the incident radiation is doubled while keeping the frequency constant, what happens to the maximum kinetic energy of the photoelectrons?
A.It is doubled
B.It is halved
C.It remains unchanged
D.It increases fourfold
- 3.
What is the physical significance of the work function () in the context of the photoelectric effect?
A.The maximum energy of the incident photon
B.The minimum energy required to eject an electron from the metal surface
C.The energy of the electron inside the nucleus
D.The kinetic energy of the fastest moving electron
Download the worksheet for Dual Nature of Radiation and Matter - Einstein’s Photoelectric Equation to practice offline. It includes additional chapter-level practice questions.
Matter Waves (De Broglie Wavelength)
SubtopicMatter Waves (De Broglie Wavelength) under Dual Nature of Radiation and Matter for Grade 12 ICSE.
Preview questions (no answers)
- 1.
Matter waves are:
A.Electromagnetic in nature
B.Mechanical waves requiring a medium
C.Probability waves associated with the position of a particle
D.Longitudinal waves in the ether
- 2.
Which of the following particles, all moving with the same velocity, will have the longest De Broglie wavelength?
A.Proton
B.Alpha particle
C.Neutron
D.Electron
- 3.
If the momentum of a particle is doubled, its De Broglie wavelength becomes:
A.Twice the original value
B.Four times the original value
C.Half of the original value
D.One-fourth of the original value
Download the worksheet for Dual Nature of Radiation and Matter - Matter Waves (De Broglie Wavelength) to practice offline. It includes additional chapter-level practice questions.