Question

Cobalt-$60$ is useful in cancer therapy Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

• A. If both assertion and reason are true and reason is the correct explanation of the assertion
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion
• C. If assertion is true, but reason is false
• D. Both assertion and reason are false statements

Answer 1

Answer: (A)

If both assertion and reason are true and reason is the correct explanation of the assertion

Answer 2

Radiotherapy is exposing tumours/cancer cells to radiations, as from radioactive cobalt-$60$, Radon-$120, I-131$. Cobalt-60 is a source of $\gamma$-radiations. These radiations kill cancer cells more rapidly than others because cancer cells are undifferentiated. Howcver, healthy cells in vicinity of cancer cells are also damaged.