41. After removing two electrons from helium atom it become?
42. Atomic packing factor of body centred cubic structure (bcc) is
43. A nuclear reactor is said to have become 'critical' when
44. Nuclear reactors used to produce electricity are based on
45. The energy obtained from atoms is known as ________
46. Which, of the following radiations has the least wavelength ?
47. For Gamma radiation, what stops its penetrating abilities?
48. An atom bomb based upon the principle of ________
49. The damage of the human body due to radiation (X-rays or gamma rays etc) is measured in :
50. Radioactivity is due to
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