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%

Concept Questions :-

de Broglie Equation
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Difficulty Level:

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+

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Difficulty Level:

Bohr's model is not valid for:-

(1) H-atom

(2) D-atom

(3) T-atom

(4) He-atom

Concept Questions :-

Bohr
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Difficulty Level:

What is the maximum wavelength in the Lyman series of He+ ion?

1. 3R

2. 1/3R

3. 1/R

4. 2R

Concept Questions :-

Hydrogen Spectra
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Difficulty Level:

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

Concept Questions :-

Number of E/P/N
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Difficulty Level:

How many spectral lines are obtained when electron jumps from n=5 to n=1 hydrogen atom?

1. 3

2. 4

3. 6

4. 10

Concept Questions :-

Hydrogen Spectra

Difficulty Level:

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

Concept Questions :-

Bohr
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Difficulty Level:

Which of the following is not correctly matched?

(1) Energy associated with Bohr's orbit E = $\frac{-2.18×{10}^{-18}×{Z}^{2}}{{n}^{2}}$

(2) Energy gap between two orbits

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

(4) Energy of one mole of photons E = N0hv/C

Concept Questions :-

Bohr
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Difficulty Level:

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

Concept Questions :-

Bohr
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Difficulty Level:

How many numbers of orbitals are possible in L-energy level?

(1) 2

(2) 4

(3) 6

(4) 1

Concept Questions :-

Quantum Numbers