Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Dual Nature of Radiation and Matter question

2012 · Q84
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Dual Nature of Radiation and Matter
  5. /2012 · Q84

Dual Nature of Radiation and Matter question

2012 · Q84

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is
  1. A
    1 : 4
  2. B
    1 : 2
  3. C
    1 : 1
  4. D
    1 : 5
View written solutionFree

Correct answer: B

According to Einsten’s photoelectric effect, the K.E. of the radiated electrons

K.Emax = E – W

12mv12{1 \over 2}mv_1^221​mv12​ = (1 - 0.5) eV = 0.5 eV

12mv22{1 \over 2}mv_2^221​mv22​ = (2.5 - 0.5) eV = 2 eV

v1v2=0.52{{{v_1}} \over {{v_2}}} = \sqrt {{{0.5} \over 2}} v2​v1​​=20.5​​ = 1 : 2

PreviousNext

More from Dual Nature of Radiation and Matter

  • If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The initial momentum of electron will be2012 · MCQ
  • A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is2012 · MCQ
  • Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is2012 · MCQ
  • An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de Broglie wavelength associated with the particle will be2012 · MCQ
  • The threshold frequency for a photosensitive metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly2011 · MCQ
  • In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is2011 · MCQ
  • Photoelectric emission occurs only when the incident light has more than a certain minimum2011 · MCQ
  • Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be2011 · MCQ