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According to Bohr atom model, in which of the following transitions will the frequency be maximum?

Option 1 -

n = 3 to n = 2

Option 2 -

n = 4 to n = 3

Option 3 -

n = 2 to n = 1

Option 4 -

n = 5 to n = 4

0 2 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    a month ago
    Correct Option - 3


    Detailed Solution:

    Δ E = h v → ( 1 n 2 2 − 1 n 1 2 )

    (1) n1 = 3, n2 = 2

        ( 1 2 2 − 1 3 2 ) = 9 − 4 3 6 = 5 3 6         

    (2) n1 = 4, n2 = 3

    ( 1 3 2 − 1 4 2 ) = 1 6 − 9 1 4 4 = 7 1 4 4        

    (3) n1 = 2, n2 = 1

    ( 1 1 2 − 1 2 2 ) = 4 − 1 4 = 3 4  

    (4) n1 = 5, n2 = 4

    ( 1 4 2 − 1 5 2 ) = 2 5 − 1 6 4 0 0 = 9 4 0 0

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Raj Pandey

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Consider the following statements:
(A) Atoms of each element emit characteristics spectrum.
(B) According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit.
(C) The density of nuclear matter depends on the size of the nucleus.
(D) A free neutron is stable but a free proton decay is possible.
(E) Radioactivity is an indication of the instability of nuclei.
Choose the correct answer from the options given below:
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Vishal Baghel

Density of nucleus is constant.

In Bohr's atomic model, the electron is assumed to revolve in a circular orbit of radius 0.5 Å. If the speed of electron is 2.2 × 10? m/s, then the current associated with the electron will be _______ × 10?² mA. [Take π as 22/7]
V
Vishal Baghel

r = 0.5Å = 0.5×10? ¹? m
v = 2.2×10? m/s
I =?
t = 2πr/v
I = e/t = ev/2πr = (1.6×10? ¹? × 2.2×10? )/ (2 × 22/7 × 0.5×10? ¹? )
I ≈ 1.12×10? ³ A = 1.12 mA = 112 × 10? ² mA

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