Q26.If the deBroglie wavelength of an electron is equal to 10− times the wavelength of a photon of frequency 6 × 1014 Hz, then the speed of electron is equal to : (Speed of light = 3 × 108 m/s) Planck's constant = 6.63 × 10−34 J. s Mass of electron = 9.1 × 10−31 kg) (1) 1.1 × 106 m/s (2) 1.7 × 106 m/s (3) 1.8 × 106 m/s (4) 1.45 × 106 m/s
What This Question Tests
This question combines the concepts of de Broglie wavelength for an electron and the wavelength of a photon to calculate the electron's speed given a ratio between their wavelengths.
Concepts Tested
Formulas Used
λ_e = h/mv
λ_photon = c/f
📚 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 ?
11.8 — Light Of Frequency 7.21 × 1014 Hz Is Incident On A Metal Surface.
Physics Class 12 · Chapter 11
11.8 Light of frequency 7.21 × 1014 Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 105 m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?
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
- 2019
- Shift
- 11 Jan Shift 1
- Q Number
- Q26
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 11: Dual Nature of Matter
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