Consider the following statements with respect to the air pressure 1 The pressure gradient is weak w...........

Geography (CDS) World climates

Consider the following statements with respect to the air pressure:

1. The pressure gradient is weak where the isobars are close to each other.

2. The frictional force is greatest at the surface of the earth.

3. The Coriolis force acts perpendicular to the pressure gradient force

How many of the above statements is/are correct?

Only one

Only two

All three

None

Statement 1 is incorrect: The differences in atmospheric pressure produce a force. The rate of change of pressure with respect to distance is the pressure gradient.The pressure gradient is strong where the isobars are close to each other and weak where they are apart.
Statement 2 is correct: Frictional Force affects the speed of the wind.It is greatest at the surface and its influence generally extends up to an elevation of 1 - 3 km.Over the sea surface, the friction is minimal as compared to the land.
Statement 3 is correct: The rotation of the earth about its axis affects the direction of the wind.This force is called the Coriolis force.The Coriolis force acts perpendicular to the pressure gradient force.
The pressure gradient force is perpendicular to an isobar.The higher the pressure gradient force, the more is the velocity of the wind and the larger the deflection in the direction of the wind.