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Physics
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Dual Nature of Radiation and Matter
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NEET Questions
Dual Nature Of Radiation And Matter
Physics
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Light of wavelength
$500nm$
is incident on a metal with a work function
$2.28eV$
. The de Borglie wavelength of the emitted electron is:
A
$≤2.8×10_{−12}m$
B
$<2.8×10_{−10}m$
C
$<2.8×10_{−9}m$
D
$≥2.8×10_{−9}m$
Hard
NEET
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If the momentum of an electron is changed by
$P$
, then the de-Broglie wavelength associated with it changes by
$0.5%$
. The initial momentum of electron will be :
A
$400P$
B
$200P $
C
$100P$
D
$200P$
Medium
NEET
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The wavelength
$λ_{e}$
of an electron and
$λ_{p}$
of a photon of same energy E are related by :
A
$λ_{p}∝λ_{e}$
B
$λ_{p}∝λ_{e}$
C
$λ_{p}∝λ_{e} $
D
$λ_{p}∝λ_{e} 1 $
Medium
NEET
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An electron of mass
$m$
and a photon have same energy
$E$
. The ratio of de-Broglie wavelength associated with them is:
A
$c1 (2mE )_{21}$
B
$(2mE )_{21}$
C
$c(2mE)_{21}$
D
$c1 (E2m )_{21}$
(
$c$
being velocity of light)
Medium
NEET
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An electron is accelerated from rest through a potential difference of
$V$
volt. If the de Broglie wavelength of the electron is
$1.227×10_{−2}nm$
, the potential difference is :
A
$10_{2}V$
B
$10_{3}V$
C
$10_{4}V$
D
$10V$
Medium
NEET
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If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :
A
25
B
75
C
60
D
50
Medium
NEET
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Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?
A
B
C
D
Medium
NEET
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An electron of mass m with an initial velocity
$V=V_{0}i^(V_{0}>0)$
enters an electric field
$E=−E_{0}i^$
(
$E_{0}=$
constant
$>0$
) at
$t=0$
. If
$λ_{0}$
is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is?
A
$λ_{0}(1+mV_{0}eE_{0} t)$
B
$λ_{0}t$
C
$(1+mV_{0}eE_{0} t)λ_{0} $
D
$λ_{0}$
Medium
NEET
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Electrons of mass m with de-Broglie wavelength
$λ$
fall on the target in an X-rays tube. The cutoff wavelength
$(λ_{0})$
of the emitted X-rays is
A
$λ_{0}=λ$
B
$λ_{0}=h2mcλ_{2} $
C
$λ_{0}=mc2h $
D
$λ_{0}=h_{2}2m_{2}c_{2}λ_{3} $
Medium
NEET
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