De Broglie Wavelength MCQs
De Broglie Wavelength MCQs
Class: CBSE Class 12
Subject: Physics
Section: Dual Nature of Radiation & Matter
Topic: De Broglie Wavelength
Based on: CBSE Board Examination Pattern (NCERT)
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. De Broglie proposed wave nature for:
Answer: B
He proposed matter waves associated with moving particles.
He proposed matter waves associated with moving particles.
2. De Broglie wavelength formula is:
Answer: A
λ = h/p where p is momentum.
λ = h/p where p is momentum.
3. Momentum p equals:
Answer: A
Classical momentum mv is used.
Classical momentum mv is used.
4. De Broglie wavelength is maximum for:
Answer: A
Smaller mass → larger wavelength.
Smaller mass → larger wavelength.
5. Unit of De Broglie wavelength:
Answer: A
It is a length quantity.
It is a length quantity.
6. If momentum doubles, wavelength:
Answer: B
λ ∝ 1/p.
λ ∝ 1/p.
7. Electron accelerated by voltage V has λ proportional to:
Answer: B
λ = h/√(2meV).
λ = h/√(2meV).
8. Planck constant unit:
Answer: A
h = 6.626×10⁻³⁴ J·s.
h = 6.626×10⁻³⁴ J·s.
9. Matter waves are significant for:
Answer: B
Large masses have negligible wavelengths.
Large masses have negligible wavelengths.
10. If velocity increases, λ:
Answer: B
λ = h/mv.
λ = h/mv.
11. Wave nature confirmed by:
Answer: A
Electron diffraction proved matter waves.
Electron diffraction proved matter waves.
12. Larger mass → wavelength:
Answer: B
λ inversely proportional to mass.
λ inversely proportional to mass.
13. Dual nature applies to:
Answer: C
All moving particles show dual nature.
All moving particles show dual nature.
14. If kinetic energy increases, λ:
Answer: B
Higher KE → higher momentum → smaller λ.
Higher KE → higher momentum → smaller λ.
15. Photon wavelength depends on:
Answer: D
All interrelated via E = hν and p = h/λ.
All interrelated via E = hν and p = h/λ.
16. de Broglie waves are:
Answer: B
Associated with moving particles.
Associated with moving particles.
17. If mass doubles, λ:
Answer: B
λ ∝ 1/m.
λ ∝ 1/m.
18. Fast moving electron has:
Answer: B
Higher velocity → smaller wavelength.
Higher velocity → smaller wavelength.
19. SI unit of momentum:
Answer: A
Used in λ = h/p.
Used in λ = h/p.
20. Matter wave concept proposed in:
Answer: B
Louis de Broglie proposed it in 1924.
Louis de Broglie proposed it in 1924.