Q26.Electrons are accelerated through a potential difference V and protons are accelerated through a potential difference 4 V. The de-Broglie wavelengths are λe and λp for electrons and protons respectively. The ratio of λe is given by: (given me is mass of electron and mp is mass of proton). λp (1) = λp λe = √mpme (2) λpλe √memp (3) = λp λe = 12 √memp (4) λpλe 2√mpme
What This Question Tests
This question requires combining the de-Broglie wavelength formula with the kinetic energy gained by a charged particle accelerated through a potential difference to find the ratio of wavelengths for an electron and a proton.
Concepts Tested
Formulas Used
λ = h / p
p = √(2mK)
K = qV
📚 NCERT Sections This Tests
11.10 — What Is The De Broglie Wavelength Of
Physics Class 12 · Chapter 11
11.10 What is the de Broglie wavelength of (a) a bullet of mass 0.040 kg travelling at the speed of 1.0 km/s, (b) a ball of mass 0.060 kg moving at a speed of 1.0 m/s, and (c) a dust particle of mass 1.0 × 10–9 kg drifting with a speed of 2.2 m/s ?
12.3 — A Difference Of 2.3 Ev Separates Two Energy Levels In An Atom. What
Physics Class 12 · Chapter 12
12.3 A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · 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.
📋 Question Details
- Chapter
- Dual Nature of Matter
- Topic
- de-Broglie Wavelength
- Year
- 2013
- Shift
- 23 Apr Online
- Q Number
- Q26
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 11: Dual Nature of Radiation and Matter
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