The correct expression derived for the energy of an electron in the nth energy level is for H-atom

1.  En=2π2 me4 K2n2 h2

2.  En=-π2 me4 K22n2 h2

3.  En=-2π2 me2 K2n2 h2

4.  En=-2π2 me4 K2n2 h2

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For any H like system, the ratio of velocities of I, II & III orbit i.e., V1 : V2 : V3 will be

1.  1 : 2 : 3

2.  1 : 1/2 : 1/3

3.  3 : 2 : 1

4.  1 : 1 : 1

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Select the incorrect graph for velocity of e- in an orbit vs. Z, 1n and n:

1.  

2.  

3.  

4.  

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Number of waves produced by an electron in one complete revolution in nth orbit is:

1.  n

2.  n2

3.  n+1

4.  2n+1

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The energy of an electron moving in nth Bohr's orbit of an element is given by En=-13.6n2Z2 eV/atom (Z=atomic number). The graph of E vs. Z2 (keeping "n" constant) will be:

1.  

2.  

3.  

4.  

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The spectrum produced from an element is:

1.  atomic spectrum

2.  line spectrum

3.  absorption spectrum

4.  any one of the above

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Which of the following expressions represents the spectrum of Balmer series (If n is the principal quantum number of higher energy level) in Hydrogen atom?

1.  v¯=Rn-1 n+1n2 cm-1

2.  v¯=Rn-2 n+24n2 cm-1

3.  v¯=Rn-2 n+2n2 cm-1

4.  v¯=Rn-1 n+14n2 cm-1

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The H-spectrum show:

1.  Heisenberg's uncertainty principle

2.  Diffraction

3.  Polarization

4.  Presence of quantized energy level

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In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the

1.  Wavelength of incident light

2.  Frequency of incident light

3.  Velocity of incident light

4.  Atomic mass of an element

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Slope of V0 vs v curve is (where V0=stopping potential, v=subjected frequency)

1.  e

2.  he

3.  ϕ

4.  h

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