A) Pressure distribution
B) Pressure gradient
C) Revolution of the earth
D) Rotation of the earth
Correct Answer: D
Solution :
Coriolis Effect is produced by rotation of the earth. If the earth were stationary, the air would flow directly from high pressure areas to low pressure areas. But the reality is that earth is not stationary, the rotation of the earth causes deflection in the path followed by winds. The force which causes this deflection is called Coriolis Effect or Coriolis Force after a French mathematician Gaspard de Coriolis. Under the influence of Coriolis force, winds get deflected to their right in northern hemisphere and to their left in the southern hemisphere. This concept was developed by W. Ferrel in 1855 and is known as Ferret's Law. This phenomenon can also be understood by Buys Ballot's Law put forward by Buys Ballot in 1857. According to this law, "If an observer stands with his back to the wind in the northern hemisphere, pressure is lower on his left hand than on his right; in the southern hemisphere, pressure is lower on his right." It is noteworthy that Coriolis force changes wind direction but not its speed.
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