Dr. Khan told his students that if charge on electrons in a chamber is 3.50 x 10 11 coulomb than mass of electrons must be
A. 9.1 x 10-31 kg
B. 8 kg
C. 4 kg
D. 2 kg
Correct Answer: D. 2 kg
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e/m ratio of the canal rays is less than that of cathode rays. The reason is
A. greater mass of canal ray particles
B. greater charge of the canal ray particles
C. greater mass and charge of the canal ray particles
D. actually e/m ratio of canal rays is greater than that of the cathode rays
Correct Answer: A. greater mass of canal ray particles
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Nuclear radiation is emitted by those elements whose
A. molecules are stable
B. molecules are unstable
C. nuclei are stable
D. nuclei are unstable
Correct Answer: D. nuclei are unstable
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Roentgen discovered X-rays and Mosley found that the frequency of the X-rays emitted from anode increases with the
A. increase in the mass number of the metal used as anode
B. decrease in the mass number of the metal used as anode
C. decrease in the proton number of the metal used as anode
D. increase in the proton number of the metal used as anode
Correct Answer: D. increase in the proton number of the metal used as anode
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Radiation emitted by excited atoms is
A. in the form of continuous waves
B. in the form of quanta
C. nuclear radiations
D. ultraviolet radiation
Correct Answer: B. in the form of quanta
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If a particle of mass 0.1gram moves with a velocity of 10,000 m/s then the wavelength of the wave associated with this particle is
A. 6.626 x 10-34 m
B. 2.145 x 10-39 m
C. 3.313 x 10-21 m
D. 1.325 x 10-18 m
Correct Answer: A. 6.626 x 10-34 m
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Second ionization energy
A. is always less than first ionization energy
B. is always greater than first ionization energy
C. is equal to the first ionization energy
D. may be greater or less than the first ionization energy depending on the nature of the element
Correct Answer: B. is always greater than first ionization energy
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