If an electron in a hydrogen atom jumps from the 3rd orbit, to the 2nd orbit, it emits a photon of wavelength λ. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be

(a) 1625λ               (b) 916λ

(c) 207λ               (d) 2013λ

Concept Questions :-

Bohr's model of atom
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Given the value of Rydberg constant is 107 m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

(a) 0.5×107m-1        (b) 0.25×107m-1

(c) 2.5×107m-1        (d) 0.025×104m-1

Concept Questions :-

Spectral series
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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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