Of the following transitions in hydrogen atom, the one which gives an absorption line of lowest frequency is

(A) n=1 to n=2

(B) n=3 to n=8

(C) n=2 to n=1

(D) n=8 to n=3

Concept Questions :-

Hydrogen Spectra
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If uncertainty in the position of an electron is zero the uncertainty in its momentum will be

(A) < h/4π

(B) > h/4π

(C) zero

(D) infinite

Concept Questions :-

Heisenberg Uncertainity Principle
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The maximum number of atomic orbitals associated with a principal quantum number 5 is

(A)9

(B)12

(C) 16

(D) 25

Concept Questions :-

Quantum Numbers
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The de Broglie wavelength of electron of He+ ion is 3.329Å. If the photon emitted upon de-excitation of this He+ ion is made to hit H atom in its ground state so as to liberate electron from it, what will be the de Broglie's wavelength of photoelectron ?

(A) 0.1518 Å

(B) 6.1518 Å

(C) 2.3518 Å

(D) 4.1218 Å

Concept Questions :-

de Broglie Equation
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Velocity of helium atom at 300 K is 2.40 x 102 meter per sec. What is its wavelength? (mass number of helium is 4) -

(A) 0.416 nm

(B) 0.83 nm

(C) 803 Å

(D) 8000 Å

Concept Questions :-

EMT Radiation
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If the Planck’s constant h=6.6 x 10-34 Js, the de-Broglie wavelength of a particle having momentum of 3.3 x 10-24 kg m s-1 will be

(A) 0.002 Å

(B) 0.02 Å

(C) 0.2 Å

(D) 2Å

Concept Questions :-

Planck's Theory
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Which of the following statements is not true with respect to photoelectric effect -

(A) The plot of kinetic energy of the photoelectrons against frequency of absorbed radiation gives a straight line parallel to x-axis

(B) The plot of K.E. of the photoelectrons against frequency of absorbed radiation gives a straight line with slope equal to h and intercept to work function of metal

(C) The plot of kinetic energy of the photoelectrons versus the intensity of incident radiation with constant frequency gives a straight line parallel to x-axis

(D) When intensity of light is increased the number of photons ejected increases but the energies of these electrons are the same.

Concept Questions :-

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The first line in the Lyman series in the spectrum of hydrogen atom occurs at a wavelength of 1215 Å and the limit for Balmer series is 3645 Å. Calculate the wavelength corresponding to series limit of Lyman series.

(A) 911.2 Å

(B) 812.2 Å

(C) 712.2 Å

(D) 678.4 Å

Concept Questions :-

Hydrogen Spectra
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Rutherford's scattering experiment is related to - 

(A) Nucleus

(B) proton

(C) Electron

(D) Neutron

Concept Questions :-

Rutherford's Experiment
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The order of increasing energies of the orbitals follows:

(A) 3S, 3p, 4s, 3d, 4p

(B)3s, 3p, 3d, 4s, 4p

(C) 3S, 3p, 4s, 4p, 3d

(D) 3s, 3p, 3d, 4p, 4s

Concept Questions :-

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