Question

1.
Time Allowed = 50 minutes
If the series limit of wavelength of the Lyman series for the hydrogen atoms is 912 A, then the
series limit of wavelength for the Balmer series of the hydrogen atom is:
at 912 Å
(b) 912 x 2 Å
(c) 912 x 4 Å
(d) 912 / 2 Å.
2.
The shortest 2. for the Lyman series of hydrogen atom is ....(Given Rw = 109678 cm)
a 912
(b) 700 Å
(c) 600 Å
(d) 811 A.
3. In Bohr's hydrogen atom, the electronic transition emitting light of longest wavelength is:
(a) n = 4 to n = 5
(b) n = 4 to n = 3
(c) n = 3 to n = 2
(d) n = 2 n = 4
4. The frequency of first line of Balmer series in hydrogen atom is vo. The frequency of corresponding
line emitted by singly ionized helium atom is:
(a) 210
(b) Avo
(c) 10/2
(d) v./4.
Which of the following radiations has the highest wave number?
(a) X-rays
(b) Microwaves
(c) I.R. rays
(d) Radiowaves
6. Which of the following particles moving with same velocity would be associated with smallest de-
Broglie wavelength?
(a) H, molecule
(b) O, molecule
(c) Helium molecule (d) N2 molecule
7. If the velocity of an electron in the first Bohr orbit of a hydrogen atom is V, then its velocity in the
third Bohr orbit will be:​

Answer 1

Answer:

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