If the velocity of a particle is reduced to 1/3rd, then percentage increase in its de-broglie wavelength will be:-

1. 100%

2. 200%

3. 50%

4. 33.33%

Subtopic:  De Broglie Equation |
 54%
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The magnetic moment order is correctly given in 

1. Fe2+ < Fe3+ < Mn4+ < Cr3+

2. Cr3+ = Mn4+ < Fe2+ < Fe3+

3. Cr3+ = Mn4+ < Fe3+ < Fe2+

4. Fe2+ < Cr3+ < Fe3+ < Mn4+

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 66%
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Bohr's model is not valid for:-

1. H-atom

2. D-atom

3. T-atom

4. He-atom

Subtopic:  Bohr's Theory |
 83%
From NCERT
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The maximum wavelength in the Lyman series of He+ ion is-

1. 3R

2. 1/3R

3. 1/R

4. 2R

Subtopic:  Hydrogen Spectra |
 66%
From NCERT
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An atom having mass number 13 has 7 neutrons. What is the atomic number of the atom?

1. 6

2. 7

3. 4

4. 5

Subtopic:  Number of Electron, Proton & Neutron |
 87%
From NCERT
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 When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

1. 3 2. 4
3. 6 4. 10
Subtopic:  Hydrogen Spectra |
 73%
From NCERT
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The frequency of radiation emitted when the electron falls from n=4 to n=1 in a hydrogen atom will be 

(Given ionization energy of H = 2.18 x 10-18J atom-1 and h=6.625 x 10-34Js

1. 2.00 x 1015 s-1

2. 1.54 x 1015 s-1

3. 1.03 x 1015 s-1

4. 3.08 x 1015 s-1

Subtopic:  Bohr's Theory |
 65%
From NCERT
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Which of the following is not correctly matched?

1. Energy associated with Bohr's orbit E = -2.18×10-18×Z2n2

2. Energy gap between two orbits E =-hc Z2RH [1n12 -1n22]

3. Kinectic energy of the ejected electron hv = hv0 + 1/2mv2

4. Energy of one mole of photons E = N0hv/C

Subtopic:  Bohr's Theory |
 57%
From NCERT
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The radius of second stationary orbit in Bohr's atom is R. The radius of 3rd orbit will be:-

1. 9R

2. R/4

3. 9R/4

4. 2R

Subtopic:  Bohr's Theory |
 77%
From NCERT
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The number of orbitals that are possible at the L-energy level is

1. 2

2. 4

3. 6

4. 1

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 64%
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