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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The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He+ ion in the first excited state will be 

(a) -13.6 eV

(b) -27.2 eV

(c) -54.4 eV

(d) -6.8 eV

Concept Questions :-

Bohr's model of atom
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An alpha nucleus of energy 12mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

(a) 1Ze                              (b) v2

(c) 1m                               (d) 1v4

Concept Questions :-

Various atomic model
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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
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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
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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
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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
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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 

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