Physics
Sound is heard over longer distances on rainy days because

Sound travels slowly in moist air
Moist air absorbs sound
Sound travels faster in moist air
Moist air does not absorb sound

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Physics
RADAR is used for:

locating geostationary satellites.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.

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