Physics Gk

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On a clean glass plate a drop of water spread to form a thin layer whereas a drop of mercury remains almost spherical because

mercury is a metal
density of mercury is greater than that of water
cohesion of mercury is greater than its adhesion with glass
cohesion of water is greater than its adhesion with glass

Sound of frequency below 20 Hz is called

audio sounds
infrasonic
ultrasonic
supersonics

RADAR is used for

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

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