Q124 / 180 · NEET 2020 (Phase 2) · Physics

What happens to the mass number and atomic number of an element when it emits γ-radiation

  • A
    Mass number decreases by four and atomic number decreases by two.
  • Correct answer
    B
    Mass number and atomic number remain unchanged.
  • C
    Mass number remains unchanged while atomic number decreases by one.
  • D
    Mass number increases by four and atomic number increases by two.

Solution

In radioactive decay of alpha particle and beta particle, the atomic number changes in both cases and in alpha decay mass number also change, after decay, the element gets in the excited state to take it in the ground state the gamma emission itself occurs and energy released in terms of the photon, but there is no change in atomic number and mass number after gamma decay. 

Hence, the correct answer is option: 'B'.

Relevant Questions