11.19 What is the de Broglie wavelength of a nitrogen molecule in air at 300 K? Assume that the molecule is moving with the root-mean square speed of molecules at this temperature. (Atomic mass of nitrogen = 14.0076 u)
11.19 What is the de Broglie wavelength of a nitrogen molecule in air at 300 K? Assume that the molecule is moving with the root-mean square speed of molecules at this temperature. (Atomic mass of nitrogen = 14.0076 u)
-
1 Answer
-
11.19 Temperature of the Nitrogen molecule, T = 300 K
Atomic mass of nitrogen = 14.0076 u
Hence, mass of Nitrogen molecule, m = 2 14.0076 u = 28.0152 u
We know, 1 u = 1.66 kg
So, m = 28.0152 1.66 kg = 4.65 kg
Planck’s constant, h = 6.626 Js
Boltzmann constant, k = 1.38 kg
We have the expression that relates to mean kinetic energy ( of the nitrogen molecule with root mean square speed ( ) as:
=
= = 516.814 m/s
De Broglie wavelength of the nitrogen molecule
= = 2.76 m = 0.0276 nm
Ther
...more
Similar Questions for you
Based on theory
z² × (13.6) (1 - ¼) = 3 × (13.6)
z = 2 . (i)
h/√2mk? = (1/2.3) × h/√2mk?
=> k? = (2.3)²k? = 5.25k? (ii)
Now, k? = E? - Φ
k? = E? - Φ = z²E? - Φ
∴ k? /k? = (10.2 - Φ)/ (4 × 10.2 - Φ) = 1/5.25
=> Φ = 3eV
- (i)
- (ii)
from (i) & (ii)
ev
hu = hu0 + K.E
Cases u = 2u0
h2u0 = hu0 + K.E1
K.E1 = hu0
- (1)
Now, cases 2
h 5u0 = hu0 + k.E2
k.E2 = 4hu0
v2 =
v2 = 2v1
This is a Short Answer Type Questions as classified in NCERT Exemplar
Sol:
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 65k Colleges
- 1.2k Exams
- 687k Reviews
- 1800k Answers