When an α-particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as:


(a)1m
(b)1m2 
(c)m
(d)1m

Concept Questions :-

Various atomic model
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Consider 3rd orbit of He+ (Helium), using the non-relativistic approach, the speed of the electron in this orbit will be given K=9x109 constant Z=2 and h (Planck's constant=6.6x10-34 J-s)

(a)2.92x108 m/s

(b)1.46x108 m/s

(c)0.73x108 m/s

(d)3.0x108 m/s

Concept Questions :-

Bohr's model of atom
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In the spectrum of hydrogen. the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:-

(a) 4/9
(b) 9/4
(c) 27/5
(d) 5/27

Concept Questions :-

Spectral series
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Hydrogen atom in ground state is excited by a monochromatic radiation of λ=975Å. The number of spectral lines in the resulting spectrum emitted will be:

(a)3

(b)2

(c)6

(d)10

Concept Questions :-

Spectral series
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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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