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Particle Nature Of Light Mcq
Quiz 11
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Q.1
The X-ray beam coming from an X-ray tube will be [ IIT 1985]
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a) Monochromatic
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b) Haing all wavelengths smaller than a certain maximum wavelength
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c) Having all wavelengths larger than a certain minimum wavelength
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d) HAving all wavelengths lying between a minimum and maximum wavelength
Explanation
Answer: (c)
Q.2
What happens when fast moving electrons are stopped and fall on the metallic target in an evacuated glass bulb [ MPPMT 1997]
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a)β particles are produced
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b) Metal become soft
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c)γ rays are produced
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d)X-rays are produced
Explanation
Answer: (d)
Q.3
X ray is ...[ CPMT 1999]
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a) Phenomenon of conservation of Kinetic energy into radiation energy
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b) Conservation of momentum
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c)Conservation of mass into energy
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d)principal of conservation of charge
Explanation
Answer: (a)
Q.4
Bragg's equation will not have solution if ....
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a) λ > 2d
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b)λ < 2d
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c)λ < d
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d)λd
Explanation
Answer:(a)
Q.5
Kα characteristic X-ray refers to the transition ..[ MPPMT 1999]
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a) n=2 to n=1
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b) n=3 to n=2
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c) n=3 to n=1
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d) n=4 to n=2
Explanation
Answer: (a)
Q.6
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation [ ISM Dhanbad]
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a)the intensity increases
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b) the minimum wavelength increases
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c)the maximum wavelength increases
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d)the minimum wavelength decreases but intensity remains same
Explanation
Answer: (d)
Q.7
When a beam of accelerated electrons hits a target which of the following wavelengths is absent in the X-ray region of spectrum, if the X-ray tube is operating at 40000 volt [ MNR 1995]
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a) 1.5 Å
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b) 0.5 Å
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c)0.25 Å
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d)1.0 Å
Explanation
from the formula λmin=ch/eVHEnce wavelength lower than 0.3Å i.e. 0.25Å will be absent from the spectrumAnswer: (c)
Q.8
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40 KeV electrons, is approximately... [MPPMT 1999]
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a) 300 Å
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b)10 Å
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c)4 Å
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d)0.31 Å
Explanation
USe formula λ=ch/eV 40 KeV=40×103×1.6×10-19 Answer:(d)
Q.9
The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å is [ EAMCET 1995]
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a) 1 : 5000
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b) 5000 : 1
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c) 1 : 25 ×106
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d) 25 × 106
Explanation
Answer: (b)
Q.10
The frequency of Kα line for an element of Z=64 is Vα and that for an element Z=80 is v'α. The ratio of frequencies of Kα lines of these elements is
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a) √(2/5)
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b) 2/√5
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c)16/25
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d)2/5
Explanation
From the formula Answer: (c)
Q.11
The wavelength of Kα lines given by molybdenum ( atomic number=42) is 0.7078Å then wavelength of Kα for zinc ( atomic number 30) will b [ raj. PET 1997]
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a) 0.354 Å
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b) 1.4147 Å
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c)09425 Å
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d)1.2547 Å
Explanation
from Moseley's law we have (Z-1)2=ν ∝ 1/λAnswer: (b)
Q.12
Velocity of photon is proportional to [ CBSE 1996] ν is frequency
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a) ν
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b) ν1/2
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c)ν-1/2
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d) ν0
Explanation
Answer:(d)
Q.13
For photoelectric emission from certain metal the cut-off frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)…[NEET 2013]
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a)
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b)
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c)
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d)
Explanation
From equation Answer:(c)
Q.14
The wavelength λe of an electron and λp of aphoton of same energy E are related by
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a)
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b)
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c)
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d)
Explanation
We will use de broglie formula for proton On squaring (i) and substituting value of E from (ii) Answer:(a)
0 h : 0 m : 1 s
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