Q34.At temperature T , the average kinetic energy of any particle is 32 kT. The de Broglie wavelength follows the order: (1) Visible photon >thermal electron >thermal (2) Thermal neutron >visible photon >thermal neutron. electron. (3) Thermal neutron >thermal electron >visible (4) Visible photon >thermal neutron >thermal photon. electron.
What This Question Tests
This multi-concept question requires comparing the de Broglie wavelengths of thermal electrons and neutrons with the wavelength of a visible photon, applying formulas for kinetic energy, momentum, and photon energy.
Concepts Tested
Formulas Used
ฮป = h/p
p = sqrt(2mK)
K = (3/2)kT
E = hc/ฮป
๐ NCERT Sections This Tests
12.8 โ A 12.5 Ev Electron Beam Is Used To Bombard Gaseous Hydrogen At
Physics Class 12 ยท Chapter 12
12.8 A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
12.5 โ A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 ยท Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
11.4 โ Monochromatic Light Of Wavelength 632.8 Nm Is Produced By A
Physics Class 12 ยท Chapter 11
11.4 Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (a) Find the energy and momentum of each photon in the light beam, (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
๐ Question Details
- Chapter
- Atomic Structure
- Topic
- De Broglie wavelength and Kinetic Energy
- Year
- 2015
- Shift
- 11 Apr Online
- Q Number
- Q34
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 2: Atomic Structure
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