The rest mass energy of an electron is A. 0.510 keV B. 0.510 M eV C. 931 keV D. 931 M eV 35

A. 0.510 keV B. 0.510 M eV

C. 931 keV D. 931 M eV
35. The nuclei ₆¹³C and ₇¹⁴N may be described as

A. isobars B. isotopes of C

C. isotones D. isotopes of N
36. If R is the radius and is the A mass number, then log R versus log A graph will be

A. a straight line B. a parabola

C. an ellipse D. none of these
37. Nuclear weak force is experienced during

A. α decay B. β decay

C. γ decay D. all a, b and c
38. During β^- decay

A. an atomic electron is ejected

B. an electron already present in the nucleus is ejected

C. a proton decays to give electron

D. a neutron decays to give electron