Important Questions of Dual Nature of Radiation and Matter Physics | Zigya

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141.

Photoelectric effect supports quantum nature of light because

  • there is minimum frequency of light below which no photoelectrons are emitted

  • the maximum energy of photoelectron depends only on the frequency of light and not on its intensity

  • photoelectric effect is an instantaneous process

  • all the above choices are correct


142.

The light of wavelength 4000 Ao falls on a photosensitive substance whose work function is 2 eV. Its stopping potential is

  • 1.1 V

  • 1.8 V

  • 1.26 V

  • 0.8 V


143.

Assertion:  An electron microscope is based on de Broglie hypothesis. 

Reason:  A beam of electrons behaves as a wave which can be converged by electric and magnetic lenses.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


144.

If velocity of a particle is three times of that of electron and ratio of de Broglie wavelength of particle to that of electron is 1.814 x 10-4. The particle will be

  • Neutron

  • Deuteron

  • Alpha

  • Tritium


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145.

Calculate the kinetic energy of the electron having wavelength 1 nm

  • 2.1 eV

  • 3.1 eV

  • 1.5 eV

  • 4.2 eV


146.

If we assume kinetic energy of a proton is equal to energy of the photon, the ratio of de Broglie wavelength of proton to photon is proportional to

  • E

  • E-1/2

  • E1/2

  • E3/2


147.

Assertion:  There is a physical significance of matter waves. 

Reason:  Both interference and diffraction occurs in it.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


148.

If  K1 and K2 are maximum kinetic energies of photoelectrons emitted when lights of wavelengths  λ1 and λ2 respectively incident on a metallic surface. If  λ1 = 3λ2, then

  • K1 > ( K2 / 3)

  • K1 < ( K2/3)

  • K1 = 2 K2

  • K2 = 2K1


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149.

If the energy, E = Gp hq cr, where G is the universal gravitational constant, h is the Planck's constant, h is the Planck's constant and c is the velocity of light, then the values of p, q and r respectively

  • -1/2, 1/2 and 5/2

  • 1/2, -1/2 and -5/2

  • -1/2, 1/2 and 3/2

  • 1/2, -/2 and -3/2


150.

Assertion:  The de Broglie equation has significance for any microscopic or submicroscopic particles. 

Reason:  The de Broglie wavelength inversely proportional to the mass of the object if velocity is constant.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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