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6%    SIMILAR QUESTIONS

Q1

Half life of a radioactive sulistance A is 4 days. The probability that a nucleus will dacay in two half lives is

Q2

The half life of The time taken for the radioactivity of a sample of to dacay to 1/6 th  of its initial value is:

Q3

The half life of 131I is 8 days. Give a sample of 131I at time t = o, we can assert that

Q4

The mass of one mole of electrons is

Q5

The increasing order for  the values of e/m is

Q6

The total number of neutrons in dipositive zinc ion with mass number 70 is

Q7

A radioactive nucleus is leing produed at a constant rate  per second. Its decay constant is λ. If No. are the number of nuclei at time t = 0, then  themanimum no, of nuclei

Q8

A radioactive sulestance has a half–life of four months three fourth of thesulestance will decay in

Q9

Half life of radium is 1600 yrs. Its average life is

Q10

No atoms of radioactive element emit N2 beta particles per second. The decay constant of element in sec–1 is