The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponging to a transition between 3rd and 4th orbit is   [1992]

(1) 3.40 eV        (2) 1.51 eV        (3) 0.85        (4) 0.66 eV

Concept Questions :-

Bohr's model of atom
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The K line obtained for molybdenum (Z = 42) target is 0.71 A. Then, the wavelength of the Kα line of copper (Z = 29) is:

(A) 2.14 A                               (B) 1.52 A

(C) 1.04 A                               (D) 0.71 A

Concept Questions :-

Spectral series
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The ratio of the energies of the hydrogen atom in its first to second excited states is

(1) 14       (2) 49          (3) 94            (4) 4

Concept Questions :-

Bohr's model of atom
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Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e. EA<EB<EC. If λ1, λ2, λ3 are the wavelengths of the radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct?

(1) λ3=λ1+λ2                    (2) λ3=λ1λ2λ1+λ2

(3) λ1+λ2+λ3=0              (4) λ32=λ12+λ22

Concept Questions :-

Spectral series
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In the Rutherford scattering experiment, what will be the correct angle for -scattering for an impact parameter, b = 0?

(a) 90                                  (b) 270

(c) 0                                    (d) 180

Concept Questions :-

Various atomic model
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The velocity of the electron in the ground state (H - atom) is 

(1) 2×105 m/s             (2) 2×106 m/s

(3) 2×107 m/s             (4) 2×108 m/s

Concept Questions :-

Various atomic model
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When element has a Kα X-ray line whose wavelength is 0.180 nm?

(1) Cobalt             (2) Xenon          (3) Copper             (4) Iron

Concept Questions :-

Spectral series
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Atoms having different atomic number as well as different mass number but having same number of neutrons 

1. isotopes                          2. isobars

3. isotones                          4. isodiaphers

Concept Questions :-

Various atomic model
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Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the Hydrogen atom:

(1) 3.7×1014 Hz                 (2) 9.1×1015 Hz

(3) 10.23×1014 Hz            (4) 29.7×1015 Hz

Concept Questions :-

Spectral series
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The energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in (eV) required to remove both the electrons from a neutral helium atom is:

1.  38.2

2.  49.2

3.  51.8

4.  79.0

Concept Questions :-

Bohr's model of atom
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