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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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When photons of energy 4.25eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy, (expressed in eV) and de Broglie wavelength The maximum kinetic energy of photoelectrons liberated from another metal B by photons of energy 4.70V is If the de Broglie wavelength of these photoelectrons is then which is not correct?
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Correct option: B
The work function of B is 3.70 eV
Option B (The work function of B is 3.70 eV) is not correct. The work function of B is calculated to be 2.75 eV, not 3.70 eV.
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Assertion: Unlike sound waves, electromagnetic waves do not require medium and can move in vacuum.
Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?
Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?