If the half life of radium is1600 year. Then mean life of radium is?And explain about mean life?

Raji Ram answered  •  1 hour ago
Average time of existence of an unstable or reactive entity.
t(mean) = 1.443*t(half)


http://hydrogen.physik.uni-wuppertal.de/hyperphysics/hyperphysics/hbase/nuclear/meanlif.html

The e.m.f. of a galvanic cell with electrode potentials of Al equal to -1.66 V and that of Mg equal to - 0.54 V is
  • a)
    + 0.44 V
  • b)
    + 1.12 V
  • c)
    - 0.44 V
  • d)
    - 1.12 V
Correct answer is option 'D'. Can you explain this answer?

Raji Ram answered  •  1 hour ago
Electrode potential Mg is greater than EP of Al . Hence Al is anode and Mg is cathode. emf = E(cathode) - E(anode) = -0.54- (-1.66) = 1.12V option B is correct not D if emf is - ve the reaction is not feasible

The e.m.f. of a galvanic cell with electrode potentials of Al equal to -1.66 V and that of Mg equal to - 0.54 V is
  • a)
    + 0.44 V
  • b)
    + 1.12 V
  • c)
    - 0.44 V
  • d)
    - 1.12 V
Correct answer is option 'D'. Can you explain this answer?

Raji Ram answered  •  1 hour ago
Electrode potential Mg is greater than EP of Al . Hence Al is anode and Mg is cathode. emf = E(cathode) - E(anode) = -0.54- (-1.66) = 1.12V option B is correct not D if emf is - ve the reaction is not feasible

If a set is empty then number of subsets will be
  • a)
    1
  • b)
    2
  • c)
    0
  • d)
    4
Correct answer is option 'A'. Can you explain this answer?

Khaja Moinuddin answered  •  4 hours ago
A set will always be a subset of itself so an empty set is also the subset of an empty set...but a coincidence every empty set is a subset of every set by this way also we can say that an empty set is also a subset of an empty set...so the answer is 1 and that one set is an empty set itself

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