Various regions of the electromagnetic spectrum are applied for different uses. statement 1: Infra-red waves are used in television remote controllers. statement 2: Radio waves are used to send television pictures from satellites to Earth. statement 3: Ultraviolet waves are used for intruder alarms. statement 4: X-rays are used for security checks. Which of the statements are correct?
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4