Atomic Structure Test

Result

Atomic Structure Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n = 4 to n = 2 are

A
Lyman lines

B
Balmer lines

C
Paschen lines

D
Bracket lines

Solution

Balmer series is characterised by the electrons transitioning from n ≥ 3 to n = 2. So, in the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n = 4 to n = 2 are Balmer lines.
Question 2
1 / -0

The following question has four choices out of which ONLY ONE is correct.

The number of waves made by a Bohr electron in an orbit of maximum magnetic quantum number 3 is

A
3

B
4

C
2

D
1

Solution

For the wave motion of the electron to continue, the circumference of the orbit should be a whole number multiple of the wavelength.number of waves λ = 2πr
λ = h/mv (by de Broglie)
number of waves = 2πr/ λ
No. of waves= 2πr÷h/mv
mvr= Angular momentum= nh/2πno. of waves= 2π(mvr)/hno of waves=2π(nh÷2π)/h = nFor, maximum magnetic quantum number 3; n = 4Therefore, number of waves made by a Bohr electron in an orbit of maximum magnetic quantum number 3 = 4.