With reference to the practical applications of the Doppler effect, consider the following statements: 1. It is used by traffic police to measure the speed of passing vehicles using RADAR or LIDAR speed guns. 2. It is used in medicine to monitor blood flow velocity in arteries and veins using Doppler ultrasonography. 3. It is used in astronomy to determine whether a star or galaxy is moving towards or away from Earth by analyzing spectral line shifts. Which of the statements given above are correct?
Options:
- A: 1 and 2 only
- B: 2 and 3 only
- C: 1 and 3 only
- D: 1, 2 and 3
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