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.

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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

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In Rutherford's alpha scattering experiment using gold foil, the kinetic energy of the alpha particle was 1.2 x 10-12J. For a head on collision, using the formula K.E. = 14πε0x 2Ze2/r0 , what may be the magnitude of r0 [ The nuclear radius of gold, Z=79; 14πε0= 9 x 109 new-ton/meter2 coulomb-2, e= 1.6x10-19 coulomb]

1. 3 x 10-14m

2. 1.3 x 10-14m

3. 2.1 x 10-14m

4. 4.3 x 10-14m

Concept Questions :-

Rutherford's Experiment
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The quantum numbers of most energetic electron in Ne atom when it is in first excited state is

(A) 2, 1, 0, +1/2

(B) 3, 1, 1, +1/2

(C) 3, 0, 0, +1/2

(D) 3, 1, 0, +1/2

Concept Questions :-

Quantum Numbers
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The frequency of line spectrum of sodium is 5.09 x 1014 sec-1. Its wavelength (in nm) will be -[C= 3x108m/sec]

(A) 510nm

(B) 420nm

(C) 589nm

(D) 622nm

Concept Questions :-

EMT Radiation
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The total number of neutrons in dipositive zinc ions with mass number 70 is -

(A) 34

(B) 40

(C)36

(D) 38

Concept Questions :-

Number of E/P/N
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With a certain exciting radiation of a particular frequency, to which hydrogen atoms are exposed, the maximum number of spectral lines obtainable in the emission is 15. The uppermost energy level to which the electron is excited is n=

(A) 4

(B) 5

(C) 6

(D) 7

Concept Questions :-

Hydrogen Spectra
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