Which of the following radiation is used to get relief from body aches?

Correct answer: (a) Infra-red radiation

Explanation

Infra-red radiation is used in physiotherapy to relieve body aches and muscle pain.

It penetrates the skin and generates heat, improving blood circulation and relaxing stiff muscles.

Unlike UV radiation (which can damage tissue), infra-red is a safe, non-invasive heat therapy for arthritis and sprains.