Question

Which of the following statements about the half-life of a radioisotope is wrong?

• A. The radioisotope is radioactive for only two half-lives
• B. After a time equals to the half-life, the rate of decay is halved
• C. The half-life is equal to half the mass of the radioisotope
• D. After two half-lives, the number of nucleus remaining is zero

Answer 1

The correct option is A The radioisotope is radioactive for only two half-lives

A

The radioactivity of the radio isotope will remain even the mass of the radio isotope is reduced or the number of nucleus is zero.