17. Which of the following statements about infrared rays is incorrect? A) They can cause burns with prolonged exposure B) They promote blood circulation C) They are used in physical therapy D) They are invisible to the human eye

The correct answer is A) They can cause burns with prolonged exposure.<br /><br />Infrared rays are a type of electromagnetic radiation that is invisible to the human eye. They are commonly used in various applications, such as physical therapy, remote controls, and thermal imaging. Infrared rays can promote blood circulation and are used in physical therapy to help with pain relief and tissue relaxation.<br /><br />However, infrared rays do not cause burns with prolonged exposure. Burns are typically caused by visible light or ultraviolet (UV) radiation, which have higher energy levels than infrared rays. Infrared rays are generally considered safe and do not cause burns or skin damage when exposed to them for extended periods.