Dual Nature of Matter NEET Questions

Physical Chemistry - Atomic Structure

Dual Nature of Matter MCQ Questions


13.
If a particle's kinetic energy doubles, its de Broglie wavelength changes by factor:
A.
√2
B.
1/√2
C.
2
D.
1/2
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ANSWER :
B. 1/√2
14.
If velocity of an electron doubles, its de Broglie wavelength:
A.
Becomes 4 times
B.
Becomes half
C.
Doubles
D.
Remains same
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ANSWER :
B. Becomes half
15.
The de Broglie wavelength of an electron is 4 Å. Its momentum is:
A.
1.66 × 10⁻²⁰ kg·m/s
B.
1.66 × 10⁻²⁶ kg·m/s
C.
1.66 × 10⁻²⁴ kg·m/s
D.
1.66 × 10⁻²² kg·m/s
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ANSWER :
C. 1.66 × 10⁻²⁴ kg·m/s
16.
de Broglie's hypothesis states that:
A.
Every moving object has wave-like properties
B.
Only matter has particle nature
C.
Wave nature is only for stationary particles
D.
Only photons have wave nature
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ANSWER :
A. Every moving object has wave-like properties
17.
The wavelength of de Broglie wave for a 1 g particle moving at 1 m/s is:
A.
Approximately 6.6 × 10⁻²⁰ m
B.
Approximately 6.6 × 10⁻²⁵ m
C.
Approximately 6.6 × 10⁻²⁹ m
D.
Approximately 6.6 × 10⁻³¹ m
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ANSWER :
D. Approximately 6.6 × 10⁻³¹ m
18.
If de Broglie wavelength of a particle equals its kinetic energy times some constant, then:
A.
λ = h × K
B.
λ = K/h
C.
λ = h × √(K/2m)
D.
λ = h/√(2mK), where K is KE
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ANSWER :
D. λ = h/√(2mK), where K is KE