Physics Gk

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Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its life
enable it to withstand higher voltages
increase its electrical conductivity
increase its electrical resistivity

On a clean glass plate a drop of water spreads 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

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