Doppler Effect
Q. Doppler Effect is perceived relative shift in- Published on 02 Mar 16a. Wavelength
b. Home Ministry
c. Amplitude
d. Frequency
ANSWER: Frequency
- You hear the high pitch of the siren of the approaching ambulance, and notice that its pitch drops suddenly as the ambulance passes you. That is called the Doppler Effect.
- The Doppler effect can be observed for any type of wave - water wave, sound wave, light wave, etc. We are most familiar with the Doppler Effect because of our experiences with sound waves.
- When the source moves towards observer, the frequency seems higher. When the source moves away, the frequency seems decreasing.
- The Doppler Effect is of intense interest to astronomers who use the information about the shift in frequency of electromagnetic waves produced by moving stars in our galaxy and beyond in order to derive information about those stars and galaxies.
- Doppler radar is an observational tool for monitoring and predicting severe weather events such as thunder storms, hailstorms, cyclones and tornados within a radius of 300 km. It not only gives information about precipitation but also about wind velocity. The Doppler weather radar system helps increase precision in weather forecasting.
