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

Difficulty Level:


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
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 the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

(a) n=3 to n=2 states

(b) n=3 to n=1 states

(c) n=2 to n=1 states

(d) n=4 to n=3 states

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 ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is:

(a) 3.4 eV                                (b) 6.8 eV

(c) 10.2 eV                              (d) zero 

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:


 

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of:

(a) excitation of electrons in the atoms 

(b) collision between the atoms of the gas 

(c) collisions between the charged particles emitted from the cathode and the atoms of the gas 

(d) collision between different electrons of the atoms of the gas 

Concept Questions :-

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

Difficulty Level:


The ratio of momenta of an electron and an α- particle which are accelerated from rest by a potential difference of 100 V is

1. 1                              2. 2memα
3. memα                      4. me2mα

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:


When subjected to a transverse electric field, cathode rays move: 

(a) Down the potential gradient

(b) Up the potential gradient

(c) Along a hyperbolic path

(d) Along a circular path

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:


The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by 
(a) Planck                   (b) J.J. Thomson
(c) Einstein                 (d) Millikan

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:


The specific charge of an electron is 

(a) 1.6×10-19 coulomb

(b) 4.8×10-10 stat coulomb

(c) 1.76×1011 coulomb/kg

(d) 1.76×10-11  coulomb/kg

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:


The kinetic energy of an electron which is accelerated through a potential of 100 volts is

(a) 1.602×10-17 J            (b) 418.6 calories
(c) 1.16×104 K                 (d) 6.626×10-14 W- sec

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: