Chapter Exam

Chapter 8: Dual Nature of Radiation and Matter — Online MCQ Test

Q: Who explained the photoelectric effect using the concept of photons?

Answer: B. Albert Einstein — Einstein explained the photoelectric effect by proposing that light consists of quanta called photons.

Q: The de Broglie wavelength of a particle is given by which formula?

Answer: B. λ = h/p — According to de Broglie's relation, the wavelength of a moving particle is h divided by its momentum p.

Q: Which experiment provided direct evidence for the wave nature of electrons?

Answer: B. Davisson and Germer experiment — The Davisson and Germer experiment showed electron diffraction, confirming the wave nature of electrons.

PHYSICS · CLASS 12th · Tamil Nadu State Board

Practice Chapter 8: Dual Nature of Radiation and Matter with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th PHYSICS. This chapter covers: This chapter covers photoelectric effect Einstein photoelectric equation and de Broglie matter waves. Students explore electron microscopes experimental validation of wave-particle.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8: Dual Nature of Radiation and Matter — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th PHYSICS — Chapter 8: Dual Nature of Radiation and Matter, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who explained the photoelectric effect using the concept of photons?

A. Max Planck
B. Albert Einstein ✓
C. Louis de Broglie
D. J. J. Thomson

Answer: B. Albert Einstein
Einstein explained the photoelectric effect by proposing that light consists of quanta called photons.

The de Broglie wavelength of a particle is given by which formula?

A. λ = mv/h
B. λ = h/p ✓
C. λ = hc/E
D. λ = eV/h

Answer: B. λ = h/p
According to de Broglie's relation, the wavelength of a moving particle is h divided by its momentum p.

Photoelectric emission will occur only when the frequency of incident light is:

A. equal to the threshold frequency
B. greater than or equal to the threshold frequency ✓
C. less than the threshold frequency
D. independent of threshold frequency

Answer: B. greater than or equal to the threshold frequency
Photoelectric emission occurs only if the incident frequency is at least the threshold frequency of the metal.

Which experiment provided direct evidence for the wave nature of electrons?

A. Young’s double-slit experiment
B. Davisson and Germer experiment ✓
C. Millikan’s oil drop experiment
D. Rutherford’s alpha scattering experiment

Answer: B. Davisson and Germer experiment
The Davisson and Germer experiment showed electron diffraction, confirming the wave nature of electrons.

Which of the following correctly matches the quantity with its dependence in the photoelectric effect?

A. Kinetic energy of emitted electrons depends on intensity only
B. Photoelectric current depends on frequency only
C. Maximum kinetic energy depends on frequency only ✓
D. Threshold frequency depends on intensity only

Answer: C. Maximum kinetic energy depends on frequency only
Maximum kinetic energy depends on the frequency of incident light, not its intensity, provided the frequency is above threshold.

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