Nuclear radiation is emitted by those elements whose
A. molecules are stable
B. molecules are unstable
C. nuclei are stable
D. nuclei are unstable
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A. molecules are stable
B. molecules are unstable
C. nuclei are stable
D. nuclei are unstable
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
A. in the form of continuous waves
B. in the form of quanta
C. nuclear radiations
D. ultraviolet radiation
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
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
A red light
B. sound waves
C. x-rays
D. photon
A. a hockey puck
B. an (American) football
C. an ellipse
D. a sphere