A student gives four claims about infrared waves. 1. They can be detected by the human eye. 2. They move at $330\,\text{m s}^{-1}$ in air. 3. They are transverse waves. 4. They are used in intruder alarms. Which of the statements are correct for infrared waves?
- A1 and 3
- B2, 3 and 4
- C2 only
- D3 and 4 only