The transition in He+ ion in balmer series that would have the same wave number as the first Lyman line in the hydrogen spectrum is:

1. 2 $\to$1

2. 5 $\to$3

3. 4 $\to$2

4. 6 $\to$4

Concept Questions :-

Hydrogen Spectra
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Concept Questions :-

Bohr
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Concept Questions :-

Bohr
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Concept Questions :-

de Broglie Equation
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

How many electrons in 19K have n=3; l=0?

1. 1

2. 2

3. 4

4. 3

Concept Questions :-

Number of E/P/N
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The ratio of the difference in energy between the first and second Bohr orbit to that between the second and the third Bohr orbit is

1. 1/2

2. 1/3

3. 4/9

4. 27/5

Concept Questions :-

Bohr
High Yielding Test Series + Question Bank - NEET 2020

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
High Yielding Test Series + Question Bank - NEET 2020

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
High Yielding Test Series + Question Bank - NEET 2020

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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