Q.1.
The X-ray beam coming from an X-ray tube will be [ IIT 1985]
-
33%
a) Monochromatic
-
33%
b) Haing all wavelengths smaller than a certain maximum wavelength
-
33%
c) Having all wavelengths larger than a certain minimum wavelength
-
0%
d) HAving all wavelengths lying between a minimum and maximum wavelength
Q.2.
What happens when fast moving electrons are stopped and fall on the metallic target in an evacuated glass bulb [ MPPMT 1997]
-
17%
a)β particles are produced
-
17%
b) Metal become soft
-
0%
c)γ rays are produced
-
67%
d)X-rays are produced
Q.3.
X ray is ...[ CPMT 1999]
-
33%
a) Phenomenon of conservation of Kinetic energy into radiation energy
-
0%
b) Conservation of momentum
-
50%
c)Conservation of mass into energy
-
17%
d)principal of conservation of charge
Q.4.
Bragg's equation will not have solution if ....
-
0%
a) λ > 2d
-
33%
b)λ < 2d
-
50%
c)λ < d
-
17%
d)λd
Q.5.
Kα characteristic X-ray refers to the transition ..[ MPPMT 1999]
-
50%
a) n=2 to n=1
-
50%
b) n=3 to n=2
-
0%
c) n=3 to n=1
-
0%
d) n=4 to n=2
Q.6.
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation [ ISM Dhanbad]
-
40%
a)the intensity increases
-
40%
b) the minimum wavelength increases
-
0%
c)the maximum wavelength increases
-
20%
d)the minimum wavelength decreases but intensity remains same
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]
-
20%
a) 1.5 Å
-
40%
b) 0.5 Å
-
40%
c)0.25 Å
-
0%
d)1.0 Å
Explanation
Q.8.
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40 KeV electrons, is approximately... [MPPMT 1999]
-
20%
a) 300 Å
-
20%
b)10 Å
-
20%
c)4 Å
-
40%
d)0.31 Å
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]
-
0%
a) 1 : 5000
-
40%
b) 5000 : 1
-
40%
c) 1 : 25 ×106
-
20%
d) 25 × 106
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
-
40%
a) √(2/5)
-
20%
b) 2/√5
-
20%
c)16/25
-
20%
d)2/5
Explanation
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]
-
0%
a) 0.354 Å
-
40%
b) 1.4147 Å
-
40%
c)09425 Å
-
20%
d)1.2547 Å
Explanation
Q.12.
Velocity of photon is proportional to [ CBSE 1996] ν is frequency
-
20%
a) ν
-
40%
b) ν1/2
-
0%
c)ν-1/2
-
40%
d) ν0
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]
-
0%
a)
-
60%
b)
-
20%
c)
-
20%
d)
Explanation
Q.14.
The wavelength λe of an electron and λp of aphoton of same energy E are related by
-
50%
a)
-
17%
b)
-
17%
c)
-
17%
d)
Explanation
