The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 A0. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is [IIT-JEE 2011]

(1) 1215 A0        (2) 1640 A0            (3) 2430 A0           (4) 4687 A0

Concept Questions :-

Spectral series
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Energy E of a hydrogen atom with principal quantum number n is given by E=-13.6n2eV.  The energy of a photon ejected when the electron jumps from n = 3 state to n = 2 state of hydrogen, is approximately [2004]

(1) 1.5 eV         (2) 0.85 eV          (3) 3.4 eV            (4) 1.9 eV

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The energy of ground electronic state of hydrogen atom is -13.6 eV.  The energy of the first excited state will be [1997]

(1) -54.4 eV         (2) -27.2 eV           (3) -6.8 eV               (4) -3.4 eV

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The total energy of an electron in the first excited state of hydrogen is about -3.4 eV. Its kinetic energy in this state is [2005]

(1) -3.4 eV            (2) -6.8 eV             (3) 6.8 eV           (4) 3.4 eV

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The energy of an electron in excited hydrogen atom is -3.4 eV. Then according to Bohr's theory, the angular momentum of the electron in Js is [Kerala PET 2002]

(1) 2.11 ×10-34 Js

(2) 3 ×10-34 Js

(3) 2×10-34 Js

(4) 0.5 ×10-34 Js

(5) 1 ×10-34 Js

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


When hydrogen atom is in its first excited level, its radius is [1997]

(1) four times, its ground state radius

(2) twice, its ground state radius

(3) same as its ground state radius

(4) half of its ground state radius

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

(1) 24.6 eV            (2) 24.6 volt          (3) 13.6 volt                 (4) 13..6 eV

Concept Questions :-

Various atomic model
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Ratio of the wavelength of first line of Lyman series and first line of Balmer series is [EAMCET (Engg. 1995; MP PMT 1997; UPSEAT 2004; KCET 2006; NEET 2013]

(1) 1 : 3           (2) 27 : 5               (3) 5 : 27                 (4) 4 : 9

Concept Questions :-

Spectral series
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The ionization energy of 10 times ionized sodium atom is:

(1) 13.6 eV            (2) 13.6×11 eV             (3) 13.611eV                  (4) 13.6×(11)2 eV

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of helium atom would be [1988]

(1) 13.6 eV            (2) 27.2 eV           (3) 6.8 eV            (4) 54.4 eV

Concept Questions :-

Bohr's model of atom
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: