While a certain isotope decays, it emits photons. what kind of decay is happening?
a. alpha decay
b. beta decay
c. gamma decay
d. positron decay

The correct answer is Option C.

Explanation:

An isotope can decay in 4 process:

1.) Alpha decay: In this process, alpha particles is emitted when a heavier nuclei decays into lighter nuclei. The alpha particle released has a charge of +2 units.

2.)Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

3.) Gamma ray emission: in this process, an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and releases . These radiations does not carry any charge and are electrically neutral.

4.) Positron decay: In this process, a proton gets converted to neutron and an electron neutrino and releases positron particles. This particle carries a charge of +1 units.

In the question, it is given that when an isotope decays, it emits photons.

Photons are the particles which are electrically neutral. When an electron jumps from high energy level to lower energy level and releases excess energy in the form of photons.

Hence, these particles are released when an isotope undergoes gamma decay and therefore, the correct answer is Option C.

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