Question

The Doppler effect can be observed for which of the following case(s):

• A. supersonic speed
• B. ultrasonic waves
• C. both of the above
• D. none of the above

Answer 1

Answer: (C)

both of the above

Ultrasonic waves are used in SONAR, which is based on Doppler effect, therefore Doppler effect is observed in ultrasonic waves .The location of planes are found by using RADAR , sometimes planes move at supersonic speed , even then RADAR works , which is also based on Doppler effect .So in both the cases, Doppler effect can be observed.