Dual nature of matter and de Broglie relation - Question Bank

1. Which phenomenon cannot be explained by the wave nature of matter?
A) Electron diffraction
B) Photoelectric effect
C) Interference of electrons
D) Diffraction of electrons
2. The de Broglie hypothesis helped in developing the model of the atom by:
A) Explaining the stability of atoms
B) Introducing the concept of electron shells and quantized energy levels
C) Predicting the existence of neutrons
D) Describing nuclear fission
3. Calculate the de Broglie wavelength of a tennis ball (mass = 58 g) hit with a velocity of 25 m/s.
A) 4.57 x 10^-34 m
B) 4.57 x 10^-31 m
C) 4.57 x 10^-37 m
D) 4.57 x 10^-40 m
4. Which of the following is NOT a fundamental constant used in the de Broglie relation?
A) Planck's constant (h)
B) Speed of light (c)
C) Mass of the particle (m)
D) Velocity of the particle (v)
5. The uncertainty principle, formulated by Heisenberg, is a direct consequence of:
A) The wave nature of matter
B) The particle nature of matter
C) Classical mechanics
D) The laws of thermodynamics
6. If the velocity of a particle is reduced to one-third, its de Broglie wavelength will:
A) Be reduced to one-third
B) Be tripled
C) Be reduced to one-ninth
D) Be increased by a factor of nine
7. What is the unit of momentum in SI units?
A) kg m/s
B) kg m/s^2
C) N s
D) Both A and C
8. The de Broglie hypothesis suggests that:
A) Light is only a wave.
B) Particles can exhibit wave-like behavior.
C) Energy is quantized.
D) Electrons orbit the nucleus in fixed paths.
9. Which of the following particles will have the smallest de Broglie wavelength if they all possess the same momentum?
A) An electron
B) A proton
C) A neutron
D) A hydrogen molecule (H2)
10. The de Broglie wavelength of a particle of mass 'm' and kinetic energy 'KE' is given by:
A) h / sqrt(m*KE)
B) h / sqrt(2*m*KE)
C) sqrt(2*m*KE) / h
D) h * sqrt(2*m*KE)
11. The square of the amplitude of the matter wave is proportional to:
A) The momentum of the particle
B) The velocity of the particle
C) The probability density of finding the particle
D) The energy of the particle
12. What is the de Broglie wavelength of a helium atom (mass ≈ 4 amu, 1 amu ≈ 1.66 x 10^-27 kg) moving at 1000 m/s?
A) 9.94 x 10^-11 m
B) 9.94 x 10^-14 m
C) 9.94 x 10^-8 m
D) 9.94 x 10^-17 m
13. Which statement best explains why we don't observe the wave nature of everyday objects like cars?
A) Cars are too large to have wave properties.
B) The de Broglie wavelength of cars is immeasurably small due to their large mass.
C) The speed of cars is too low for wave properties to manifest.
D) The de Broglie relation only applies to subatomic particles.
14. The de Broglie wavelength of a particle is independent of:
A) Its mass
B) Its velocity
C) Planck's constant
D) Its charge
15. If the momentum of a particle is decreased by half, its de Broglie wavelength will:
A) Be halved
B) Be doubled
C) Remain the same
D) Become one-fourth
16. The wave associated with a moving particle is called a:
A) Matter wave
B) Light wave
C) Sound wave
D) Gravity wave
17. What is the de Broglie wavelength of a proton (mass = 1.67 x 10^-27 kg) moving at a velocity of 1.0 x 10^5 m/s?
A) 3.96 x 10^-12 m
B) 3.96 x 10^-9 m
C) 3.96 x 10^-6 m
D) 3.96 x 10^-3 m
18. In the context of wave-particle duality, a particle's wave is often referred to as a:
A) Probability wave
B) Electromagnetic wave
C) Transverse wave
D) Longitudinal wave
19. The wave nature of matter is primarily described by the:
A) Newton's Laws of Motion
B) De Broglie relation
C) Maxwell's Equations
D) Bohr Model
20. The de Broglie wavelength of a particle is inversely proportional to its:
A) Energy
B) Frequency
C) Momentum
D) Charge
21. Which physical quantity is conserved in both wave and particle descriptions of matter?
A) Position
B) Momentum
C) Frequency
D) Amplitude
22. If the mass of a particle increases by a factor of 4, and its velocity remains constant, the de Broglie wavelength will:
A) Increase by a factor of 4
B) Decrease by a factor of 4
C) Increase by a factor of 2
D) Decrease by a factor of 2
23. What is the momentum of a photon with a wavelength of 500 nm? (h = 6.626 x 10^-34 J s, c = 3 x 10^8 m/s)
A) 1.325 x 10^-27 kg m/s
B) 1.325 x 10^-21 kg m/s
C) 1.325 x 10^-30 kg m/s
D) 1.325 x 10^-18 kg m/s
24. The de Broglie relation is applicable to:
A) Only photons
B) Only electrons
C) All matter particles
D) Only charged particles
25. The concept of wave-particle duality was first experimentally verified for:
A) Light
B) Electrons
C) Protons
D) Neutrons
26. If the kinetic energy of a particle is doubled, its de Broglie wavelength will change by a factor of:
A) sqrt(2)
B) 1/sqrt(2)
C) 2
D) 1/2
27. The wave nature of macroscopic objects (like a baseball) is generally not observed because:
A) They have very large mass, making their de Broglie wavelength extremely small.
B) They move too slowly.
C) They have too much momentum.
D) Planck's constant is too large for them.
28. What is the de Broglie wavelength of a 1 kg object moving at 1 m/s?
A) 6.626 x 10^-34 m
B) 1.0 m
C) 6.626 x 10^-34 J s
D) 1.0 x 10^-34 m
29. Calculate the de Broglie wavelength of an electron (mass = 9.11 x 10^-31 kg) moving at a velocity of 1.0 x 10^6 m/s. (h = 6.626 x 10^-34 J s)
A) 7.27 x 10^-10 m
B) 7.27 x 10^-7 m
C) 7.27 x 10^-13 m
D) 7.27 x 10^-4 m
30. Which of the following statements is INCORRECT regarding the de Broglie wavelength?
A) It is inversely proportional to momentum.
B) It is inversely proportional to velocity.
C) It is directly proportional to mass.
D) It depends on Planck's constant.
31. The wave-particle duality means that matter exhibits both:
A) Mass and charge
B) Wave and particle properties
C) Energy and momentum
D) Velocity and acceleration
32. Combining E=hν and p=E/c, the de Broglie wavelength of a photon is given by:
A) λ = h/p
B) λ = p/h
C) λ = h*p
D) λ = c/ν
33. The momentum of a photon can be expressed in terms of its energy (E) and the speed of light (c) as:
A) p = E/c
B) p = c/E
C) p = E*c
D) p = E^2*c
34. For a photon, which equation relates its energy (E) and its frequency (ν)?
A) E = hν
B) E = ν/h
C) E = h/ν
D) E = 1/(hν)
35. Using the relationship between KE and momentum, the de Broglie wavelength can also be expressed as:
A) λ = h / sqrt(2m*KE)
B) λ = sqrt(2m*KE) / h
C) λ = h * sqrt(2m*KE)
D) λ = h / (2m*KE)
36. The kinetic energy (KE) of a particle is related to its momentum (p) and mass (m) by the equation:
A) KE = p^2 / (2m)
B) KE = (2m) / p^2
C) KE = p / (2m)
D) KE = (2p) / m
37. The Davisson-Germer experiment demonstrated the wave nature of:
A) Protons
B) Neutrons
C) Electrons
D) Alpha particles
38. Which experimental evidence strongly supports the wave nature of electrons?
A) Photoelectric effect
B) Compton scattering
C) Davisson-Germer experiment
D) Blackbody radiation
39. The de Broglie hypothesis is a cornerstone of which quantum mechanical concept?
A) Classical Mechanics
B) Quantum Mechanics
C) Thermodynamics
D) Relativity
40. If a particle's velocity is doubled, its de Broglie wavelength will be:
A) Doubled
B) Halved
C) Quadrupled
D) One-fourth
41. What is the unit of Planck's constant (h)?
A) Joule-second (J s)
B) Joule per second (J/s)
C) Joule per meter (J/m)
D) Joule (J)
42. The de Broglie wavelength of an electron moving with a velocity 'v' is given by:
A) λ = h / (m*v)
B) λ = (m*v) / h
C) λ = h*m*v
D) λ = h / m
43. The wave nature of matter is significant for particles that have:
A) High mass and high velocity
B) Low mass and high velocity
C) High mass and low velocity
D) Low mass and low velocity
44. Which of the following has the longest de Broglie wavelength, assuming they all have the same kinetic energy?
A) An electron
B) A proton
C) A neutron
D) A helium atom
45. If the momentum of a particle increases, its de Broglie wavelength will:
A) Increase
B) Decrease
C) Remain the same
D) Become zero
46. In the de Broglie equation, 'p' represents:
A) Planck's constant
B) The momentum of the particle
C) The wavelength of the particle
D) The energy of the particle
47. In the de Broglie equation, 'h' represents:
A) The mass of the particle
B) The velocity of the particle
C) Planck's constant
D) The momentum of the particle
48. The de Broglie wavelength (λ) of a particle is given by the equation:
A) λ = h/p
B) λ = p/h
C) λ = h*p
D) λ = 1/(h*p)
49. What is the de Broglie wavelength of a particle directly proportional to?
A) Its momentum
B) Its kinetic energy
C) Its mass
D) Its velocity
50. Who proposed the dual nature of matter, suggesting that particles like electrons can exhibit wave-like properties?
A) Albert Einstein
B) Niels Bohr
C) Louis de Broglie
D) Max Planck
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