De Broglie Waves NEET Questions

Physics - Dual Nature of Matter and Radiation

De Broglie Waves MCQ Questions


13.
If the velocity of a particle is doubled (non-relativistic), its de Broglie wavelength becomes:
A.
Twice its original value
B.
Four times its original value
C.
One-fourth of its original value
D.
Half of its original value
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ANSWER :
D. Half of its original value
14.
Why don't we observe wave-like properties of macroscopic objects (e.g., a bowling ball) in everyday life?
A.
Their de Broglie wavelength is far too small to be measured
B.
Planck's constant is too small for them
C.
They move at speed of light
D.
They have no momentum
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ANSWER :
A. Their de Broglie wavelength is far too small to be measured
15.
Why is the wave nature of particles significant in the SUB-ATOMIC domain?
A.
Atomic forces are wave-like
B.
Sub-atomic particles travel near speed of light
C.
Quantum effects only exist below room temperature
D.
Sub-atomic particles have small mass, hence large de Broglie wavelength comparable to atomic dimensions
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ANSWER :
D. Sub-atomic particles have small mass, hence large de Broglie wavelength comparable to atomic dimensions
16.
The de Broglie relation λ = h/p, when applied to a photon, gives:
A.
A different wavelength
B.
Zero wavelength
C.
The same wavelength as the photon's electromagnetic wavelength
D.
Infinite wavelength
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ANSWER :
C. The same wavelength as the photon's electromagnetic wavelength
17.
For a photon, the de Broglie relation gives λ = c/ν because:
A.
The de Broglie relation doesn't apply to photons
B.
Photon momentum p = hν/c, so h/p = c/ν
C.
Photons travel at infinite speed
D.
Photons have rest mass m₀ such that mc = hν
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ANSWER :
B. Photon momentum p = hν/c, so h/p = c/ν
18.
The fact that λ = h/p works for both photons and material particles shows:
A.
Momentum is always conserved
B.
Wave-particle duality is a universal feature, with h as the bridge
C.
Photons and electrons are the same particle
D.
Mass is irrelevant in physics
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ANSWER :
B. Wave-particle duality is a universal feature, with h as the bridge