Which of the following waves are used to treatment of muscles ache?

Step-by-step solution

Infrared waves are electromagnetic waves with wavelengths longer than visible light but shorter than microwaves. They possess thermal energy, which is absorbed by the skin and underlying tissues, causing vasodilation and increased blood flow. This thermal effect is widely used in physiotherapy to provide relief from muscle aches, stiffness, and joint pain by promoting healing and relaxing the muscles. Answer: infrared