De Broglie Waves NEET Questions

Physics - Dual Nature of Matter and Radiation

De Broglie Waves MCQ Questions


7.
The de Broglie wavelength is INDEPENDENT of which property of the particle?
A.
Mass
B.
Charge
C.
Velocity
D.
Momentum
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ANSWER :
B. Charge
8.
In the de Broglie relation Ī» = h/p, the constant h is:
A.
Planck's constant (ā‰ˆ 6.626 Ɨ 10ā»Ā³ā“ JĀ·s)
B.
Electron charge (ā‰ˆ 1.6 Ɨ 10ā»Ā¹ā¹ C)
C.
Speed of light (ā‰ˆ 3 Ɨ 10āø m/s)
D.
Boltzmann constant (ā‰ˆ 1.38 Ɨ 10ā»Ā²Ā³ J/K)
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ANSWER :
A. Planck's constant (ā‰ˆ 6.626 Ɨ 10ā»Ā³ā“ JĀ·s)
9.
The de Broglie wavelength is also called:
A.
Particle radius
B.
Matter wavelength (or wavelength of the matter wave)
C.
Compton wavelength
D.
Photon wavelength
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ANSWER :
B. Matter wavelength (or wavelength of the matter wave)
10.
For a given momentum, the de Broglie wavelength is:
A.
Inversely proportional to momentum
B.
Proportional to square of momentum
C.
Directly proportional to momentum
D.
Independent of momentum
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ANSWER :
A. Inversely proportional to momentum
11.
For particles of equal momentum, which has the SHORTEST de Broglie wavelength?
A.
The particle with highest velocity
B.
The particle with smallest mass
C.
All have the same de Broglie wavelength
D.
The particle with largest mass
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ANSWER :
C. All have the same de Broglie wavelength
12.
For a heavier particle moving with the same velocity as a lighter particle, the de Broglie wavelength is:
A.
Smaller (because momentum is larger)
B.
Always zero
C.
The same
D.
Larger
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ANSWER :
A. Smaller (because momentum is larger)