The energy of a hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n = 5 is 

(1) - 0.54 eV          (2) - 5.40 eV          (3) - 0.85 eV          (4) -2.72 eV

Concept Questions :-

Bohr's model of atom
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The wave number of a photon in Brackett series of hydrogen atom is 9400R. The electron has transited from the orbit havit quantum number [Odisha JEE 2012]

(1) 5              (2) 6             (3) 4                 (4) 7

Concept Questions :-

Spectral series
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In an experiment to determine the e/m value for an electron using Thomson's method the electrostatic deflection plates were 0.01 m apart and had a potential difference of 200 volts applied. Then the electric field strength between the plates is 

(1) 1×104 V/m                          (2) 2×104 V/m

(3) 4×104 V/m                          (4) 5×105 V/m

Concept Questions :-

Various atomic model
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Which of the following spectral series in hydrogen atom gives spectral line of 4860 A0?

(1) Lyman          (2) Balmer         (3) Paschen             (4) Brackett

Concept Questions :-

Spectral series
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Hydrogen H11, Deuterium H21, singly ionised Helium H2e4+ and doubly ionised lithium L3i6++ all have one electron around  the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are λ1, λ2, λ3 and λ4 respectively then approximately which one of the following is correct [JEE (Main) 2014]

(1) 4λ1=2λ2=2λ3=λ4                  (2) λ1=2λ2=2λ3=λ4

(3) λ1=λ2=4λ3=9λ4                    (4) λ1=2λ2=3λ3=λ4

Concept Questions :-

Bohr's model of atom
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To explain his theory, Bohr used

(1) conservation of linear momentum

(2) conservation of angular momentum

(3) conservation of quantum  frequency

(4) conservation of energy

Concept Questions :-

Bohr's model of atom
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The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volt is equal to 

(1) eVhc               (2) ehcV               (3) hceV               (4) cVeh

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The graph between the square root of the frequency of a specific line of the characteristic spectrum of X-rays and the atomic number of the target will be:

(1) 

(2) 

(3) 

(4) 

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The wavelength of Kα X-rays for lead isotopes Pb208, Pb206, Pb204 are λ1, λ2 and λ3 respectively. Then

(1) λ1=λ2>λ3                         (2) λ1>λ2>λ3

(3) λ1<λ2<λ3                         (4) λ2=λ1=λ3

Concept Questions :-

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which of the following is positively charged?

a.  α-particles  

b.  β-particles  

c.  γ-rays  

d.  X-rays

Concept Questions :-

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