De Broglie's Relationship NEET Questions

Physical Chemistry - Atomic Structure

De Broglie's Relationship MCQ Questions


13.
If the mass of a moving particle is doubled while its velocity is halved, what happens to its de Broglie wavelength?
A.
It remains unchanged
B.
It becomes four times the original
C.
It becomes half the original
D.
It becomes double the original
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ANSWER :
A. It remains unchanged
14.
The de Broglie wavelength (λ) of a particle plotted against the reciprocal of its momentum (1/p) gives a graph of what shape?
A.
An exponential curve
B.
A straight line passing through the origin
C.
A hyperbola
D.
A parabola
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ANSWER :
B. A straight line passing through the origin
15.
Which of the following statements correctly relates de Broglie's hypothesis to Bohr's model of the hydrogen atom?
A.
Stable Bohr orbits are those in which a whole number of de Broglie wavelengths fit exactly around the orbit's circumference
B.
Bohr orbits contradict de Broglie's wave hypothesis
C.
De Broglie waves apply only to photons, not electrons in atoms
D.
An electron can revolve in any orbit around the nucleus, regardless of wavelength
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ANSWER :
A. Stable Bohr orbits are those in which a whole number of de Broglie wavelengths fit exactly around the orbit's circumference
16.
For an electron accelerated through a potential difference of 100 V, which relation should be used to calculate its de Broglie wavelength?
A.
λ = mc²/hV
B.
λ = hc/eV
C.
λ = h/(eV)
D.
λ = h/√(2meV)
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ANSWER :
D. λ = h/√(2meV)
17.
A photon and an electron have the same de Broglie wavelength. What can be concluded about them?
A.
They must have the same energy
B.
They must have the same mass
C.
They must have the same velocity
D.
They must have the same momentum
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ANSWER :
D. They must have the same momentum
18.
According to de Broglie's concept, which of the following correctly describes the nature of matter waves associated with a moving electron?
A.
They travel at the speed of light regardless of the electron's velocity
B.
They are electromagnetic waves similar to light
C.
They are mechanical waves requiring a physical medium
D.
They are waves whose wavelength depends on the mass and velocity of the electron
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ANSWER :
D. They are waves whose wavelength depends on the mass and velocity of the electron