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

2014 · Q135
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. /2014 · Q135

Dual Nature of Radiation and Matter question

2014 · Q135

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de Broglie wavelength of the particle is
  1. A
    25
  2. B
    75
  3. C
    60
  4. D
    50
View written solutionFree

Correct answer: B

de-Broglie wavelength of particle,

λ\lambda λ = hp{h \over p}ph​ = h2mE{h \over {\sqrt {2mE} }}2mE​h​

∴\therefore∴ λ′λ=EE′{{\lambda '} \over \lambda } = \sqrt {{E \over {E'}}} λλ′​=E′E​​

⇒\Rightarrow⇒ λ\lambda λ' = λ4{\lambda \over 4}4λ​

So, % change in the de Broglie wavelength

= λ−λ4λ×100{{\lambda - {\lambda \over 4}} \over \lambda } \times 100λλ−4λ​​×100 = 75%

PreviousNext

More from Dual Nature of Radiation and Matter

  • A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :2013 · MCQ
  • The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is2013 · MCQ
  • A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?2013 · MCQ
  • For photoelectric emission from certain metal the cutoff frequency is υ. If radiation of frequency 2υ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)2013 · MCQ
  • The wavelength λe of an electron and λp of a photon of same energy E are related by2013 · MCQ
  • 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 is2012 · MCQ
  • 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