If the speed of electron in Bohr's first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is:

1. x/9

2. x/3

3. 3x

4. 9x

Subtopic:  Bohr's Theory |
 69%
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In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit n=1 to the period of revolution of the electron in the orbit n=2 is

1. 1:2

2. 2:1

3. 1:4

4. 1:8

Subtopic:  Bohr's Theory |
 62%
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A cricket ball of 0.5 kg is moving with a velocity of 100 ms-1. The wavelength associated with its motion is:

1. 1/100cm

2. 6.6 x 10-34m

3. 1.32 x 10-35m

4. 6.6 x 10-28m

Subtopic:  De Broglie Equation |
 84%
From NCERT
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The number of electrons in  19 K with quantum numbers n=3; l=0 is/are:

1. 2

2. 1

3. 4

4. 3

Subtopic:  Number of Electron, Proton & Neutron |
From NCERT
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The ratio of the difference in energy between the first and second Bohr orbit of H to that between the second and the third Bohr orbit is 

1. 1/2

2. 1/3

3. 4/9

4. 27/5

Subtopic:  Bohr's Theory |
 76%
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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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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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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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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NEET 2023 - Target Batch - Aryan Raj Singh
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