Which of the following are the applications of Doppler effect 1 Using RADAR guns to estimate velocit...........

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Which of the following are the applications of Doppler effect?

1. Using RADAR guns to estimate velocity of an approaching vehicle.

2. Prediction of movement and direction of rain bearing clouds.

3. Marine animals can navigate in the absence of light using it.

Select the answer using the codes given below:

3 only

1 and 3 only

1 and 2 only

All of the above

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Explanation:

The satellites are launched from Eastern coast because:
•To take the initial boost of earth's surface velocity i.e 1600km/hr at equator(only for geostationary satellites which will be placed above equator for communication purpose).
•Coriolis force is zero.
•Just in case of failure of launch the satellite does not fall on built up hinterland.

When the sound is repeated due to reflection of sound waves, it is called echo. Soft surface absorbs sound. So, it is when sound is reflected from a hard surface like tall brick wall or a cliff, we hear echo.
Uses of echo:-
To measure depth of sea.
To locate underwater objects.
To investigate inside human body.
Echolocation is used for navigation and for foraging (or hunting) in various environments. Echolocating animals include some mammals and a few birds;
https://en.wikipedia.org/wiki/Doppler_effect#Application