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Why Photoelectric Effect Cannot Be Explained on the Basis of Wave Nature of Light? Give Reasons. - Physics

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प्रश्न

Why photoelectric effect cannot be explained on the basis of wave nature of light? Give reasons.

उत्तर

 Wave nature of radiation cannot explain the following:

(i) The instantaneous ejection of photoelectrons.

(ii) The existence of threshold frequency for a metal surface.

(iii) The fact that kinetic energy of the emitted electrons is independent of the intensity of light and depends upon its frequency.

Thus, the photoelectric effect cannot be explained on the basis of wave nature of light.

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2012-2013 (March) Delhi Set 2

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संबंधित प्रश्‍न

The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which

(a) an electron, and

(b) a neutron, would have the same de Broglie wavelength.


An electron and a photon each have a wavelength of 1.00 nm. Find

(a) their momenta,

(b) the energy of the photon, and

(c) the kinetic energy of electron.


Find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of `(3/2)` kT at 300 K.


Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).


A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de Broglie wavelength of the particle varies cyclically between two values λ1, λ2 with λ1 > λ2. Which of the following statement are true?

  1. The particle could be moving in a circular orbit with origin as centre.
  2. The particle could be moving in an elliptic orbit with origin as its focus.
  3. When the de Broglie wavelength is λ1, the particle is nearer the origin than when its value is λ2.
  4. When the de Broglie wavelength is λ2, the particle is nearer the origin than when its value is λ1.

Assuming an electron is confined to a 1 nm wide region, find the uncertainty in momentum using Heisenberg Uncertainty principle (∆x∆p ≃ h). You can assume the uncertainty in position ∆x as 1 nm. Assuming p ≃ ∆p, find the energy of the electron in electron volts.


Given below are two statements:

Statement - I: Two photons having equal linear momenta have equal wavelengths.

Statement - II: If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease.

In the light of the above statements, choose the correct answer from the options given below.


For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?


Which of the following graphs correctly represents the variation of a particle momentum with its associated de-Broglie wavelength?


How will the de-Broglie wavelength associated with an electron be affected when the accelerating potential is increased? Justify your answer.


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