Ratio of longest wavelengths corresponding to Lyman and Balmer series in twinge!) spectrum ts

(a)5/27

(b)3/23

(c)7/29

(d)9/31

Concept Questions :-

Spectral series
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Electron in hydrogen atom first jumps from third exicted state to second exicted state and then from second exicted to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is

(a) 7/5

(b) 27/20

(c) 27/5

(d) 20/7

Concept Questions :-

Bohr's model of atom
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An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

(a)24 hR25 m                                (b)25 hR24m

(c)25m24hR                                 (d)24m25hR

(m is the mass of the electron, R Rydberg constant and h Planck's constant)

Concept Questions :-

Bohr's model of atom
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Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V.The threshold frequency of the material is:

(a)4×1015Hz                               (b)5×1015Hz

(c)1.6×1015Hz                            (d)2.5×1015Hz

Concept Questions :-

Bohr's model of atom
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The transition from the state n=3 to n=1

a hydrogen like atom results in ultraviolet

radiation. Infrared radiation will be obtained

in the transition from

(a) 21

(b) 32

(c) 42

(d) 43

Concept Questions :-

Spectral series
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The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number Z of hydrogen-like ion is 

(a) 4                                                  (b) 1

(c) 2                                                  (d) 3

Concept Questions :-

Spectral series
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The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He+ ion in the first excited state will be 

(a) -13.6 eV

(b) -27.2 eV

(c) -54.4 eV

(d) -6.8 eV

Concept Questions :-

Bohr's model of atom
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An alpha nucleus of energy 12mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

(a) 1Ze                              (b) v2

(c) 1m                               (d) 1v4

Concept Questions :-

Various atomic model
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The electron in the hydrogen atom jumps from excited state n=3 to its ground state n=1 and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in the nth state En=-13.6n2eV)

1. 5.1 V                                               2. 12.1 V

3. 17.2 V                                              4. 7 V

Concept Questions :-

Bohr's model of atom
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In a Rutherford scattering experiment when a projectile of charge Z1 and mass M1 approaches a target nucleus of charge Z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is 

(a) directly proportional to M1×M2

(b) directly proportional to Z1Z2

(c) inversely proportional to Z1

(d) directly proportional to mass M1

Concept Questions :-

Various atomic model
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