Half life of Na 24 is 900 minutes. What is its decay constant?

The half life ( t 1 / 2 ) = 900 minute As, decay constant λ = 0 . 693 t 1 / 2 ∴ λ = 0 . 693 900 = 0 . 00077 min - 1 .

Decay constant of Hg 197 is 0 . 017 h - 1 . What is its half life?

Given: The decay constant of Hg 197 λ = 0 . 017 h - 1 Half life ( t t / 2 ) = 0 . 693 λ = 0 . 693 0 . 017 = 40 . 76 hour .

The total binding energy of Ni 58 is 508 MeV . What is its binding energy per nucleon?

Total binding energy of Ni 58 = 508 Mev A mass number of 58 signifies the number of nucleons. ∴ Binding energy per nucleon = 508 58 = 8 . 758 Mev .

How many α and β - particles are emitted in the transmutation Th 90 232 ⟶ Pb 82 208 ?

Th 90 232 → Pb 82 208 + x He 2 4 + y e - 1 0 Balancing the atomic number on both the sides, 90 = 82 + 2 x - y 2 x - y = 8 . . . . . ( 1 ) Balancing the mass, 232 = 208 + 4 x + 0 4 x = 24 x = 6 . . . . . . ( 2 ) from ( 1 ) and ( 2 ) 2 ( 6 ) - y = 8 y = 12 - 8 y = 4 Hence, the number of α particles emitted = 6 And, the number of β particles = 4