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- 1. Multiple Choice
- 2. Multiple Choice
Sample of Li

^{+2 }ions in excited state when bombarded by photons of wavelength 54 nm gets to another excited state. In returning back to ground state a total of six different types of photons were emitted. Out of six types of photons, three have wavelength lass than 54nm. Theninitial orbit number = 2

final excited state = 5

final exited state=6

initial orbit no = 3

- 3. Multiple Choice
A certain electronic transition from an excited state to ground state of the H atom in one or more step gives rise to three lines in the ultra violet region of the spectrum. How many lines does this transition produce in the infrared region of the spectrum :–

1

2

3

4

- 4. Multiple Choice
If 9.9 eV energy is supplied to H atom, the no. of spectral lines emitted is equal to :-

0

1

2

4

- 5. Multiple Choice
An atom has x energy level, then total number of lines in its spectrum are :

1+2 +3 +..............(x+1)

1 +2 +3..........x

^{2}1 +2+3.......(x-1)

(x+1)(x+2)(x+3)....

- 6. Multiple Choice
In H-atom, electron transits from 6th orbit to 2nd orbit in multi step, then total spectral lines (without Balmer series) will be:

10

6

4

0

- 7. Multiple Choice
Li

^{+2}Li

^{+}He

^{+}Be

^{+3} - 8. Multiple Choice
If the shortest wavelength of Lyman series of H atom is x, then the wave length of first line of Balmer series of H atom will be :-

9x/5

36x/5

5x/9

5x/36

- 9. Multiple Choice
Find maximum no of different spectral lines for H-atom spectrum if sample contains only two atoms and electronic transition takes place from n=4 to n=1

1

2

3

4

- 10. Multiple Choice
calculate maximum and minimum no of spectral lines if sample contains only single H atom and transition takes place from n=4 to n=1

1,3

2,3

3,1

3,2

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