Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

The quantum nature of light is supported by the photoelectric effect because

Options

Athe maximum kinetic energy of the photoelectrons is determined solely by the light's frequency, and not by its
Bphotoelectrons leave the metal surface immediately, even when it is faintly illuminated
Cthe electric charge of the photoelectrons is quantized
Da minimum frequency exists below which no photoelectrons are emitted

Correct answer

D. a minimum frequency exists below which no photoelectrons are emitted

Step-by-step solution

The photoelectric effect provides evidence for the quantum nature of light (photon theory) by explaining phenomena that classical wave theory could not: According to the photon theory, light consists of discrete energy packets (photons) with energy E = h . The maximum kinetic energy of emitted photoelectrons is given by Einstein's photoelectric equation K_ = h - , which shows it depends solely on the frequency and not on the intensity of light. The emission of photoelectrons is an instantaneous process. A single ph

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