NEET Physics Dual Nature of Radiation and Matter MCQs Set 01

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Question: A particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to
a) H–1/2
b) H0
c) H1/2
d) H
Answer: A

Question: The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nuclear with 1 MeV energy is nearly
a) 1.2 × 10–3 nm
b) 1.2 × 10 nm
c) 1.2 nm
d) 1.2 × 10–6 nm
Answer: A

Question: Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber. Then,
a) electrons can be emitted with any energy, with a maximum of E0
b) None of these
c) electrons can be emitted but all with an energy, E0
d) no electrons will be emitted as only photons can emit electrons
Answer: A

Question:  When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is :
a) 1.0 eV
b) 1.3 eV
c) 1.5 eV
d) 0.65 eV
Answer: A

Question:  A 15.0 eV photon collides with and ionizes a hydrogen atom. If the atom was originally in the ground state (ionization potential =13.6 eV), what is the kinetic energy of the ejected electron?
a) 1.4 eV
b) 13.6 eV
c) 28.6 eV
d) 15.0 eV
Answer: A

Question:  Assertion : Photoelectric saturation current increases with mthe increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.
a) Assertion is incorrect, reason is correct
b) Assertion is correct, reason is incorrect
c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
d) Assertion is correct, reason is correct; reason is a correct explanation for assertion
Answer: A

Question: Assertion : In process of photoelectric emission, all emitted electrons do not have same kinetic energy.
Reason : If radiation falling on photosensitive surface of a metal consists of different wavelength then energy acquired by electrons absorbing photons of different wavelengths shall be different.
a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
c) Assertion is correct, reason is incorrect
d) Assertion is incorrect, reason is correct.
Answer: A

Question:  When 0.50 Å X-rays strike a material, the photoelectrons from the k shell are observed to move in a circle of radius 23 mm in a magnetic field of 2 × 10–2 tesla acting perpendicularly to the direction of emission of photoelectrons. What is the binding energy of k-shell electrons?
a) 6.2 keV
b) 2.9 keV
c) 5.5 keV
d) None of these
Answer: A

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