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CBSE
Class 12 Physics
Dual Nature Of Radiation And Matter
Quiz 2
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Which Characteristic of a target does the Mosley's law relate the frequency of X-rays?
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density
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atomic number
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atomic weight
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interatomic space
Explanation
atomic number
The charge of a photo electron is :
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9.1 × 10
-31
C
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9.1 × 10
-27
C
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9.1 × 10
-24
C
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none of these
Explanation
none of these
The number of photons of frequency n present in energy E, in terms of Planck's constant h:
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\(\frac{E}{nh}\)
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nhE
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\(\frac{nh}{E}\)
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\(\frac{nE}{h}\)
Explanation
\(\frac{E}{nh}\)
Compared to liquids and solids, gases are:
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good conductors of electricity
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best conductors of electricity
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very poor conductors of electricity
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good or bad conductors of electricity depending upon the nature of the gas
Explanation
very poor conductors of electricity
The different stages of discharge in a discharge tube can be explained on the basis of:
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the wave nature of light
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the dual nature of light
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wave nature of electrons
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the collision between the charged particles emitted from the cathode the atoms of the gas in the tube
Explanation
the collision between the charged particles emitted from the cathode the atoms of the gas in the tube
When an electron jumps across a potential difference of 1 V, it gains energy equal to :
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1.602 × 10
-19
J
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1.602 × 10
19
J
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1.602 × 10
24
J
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1 J
Explanation
1.602 × 10
-19
J
0 h : 0 m : 1 s
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