Chapter 8, Problem 10RAT

Wind speeding up as it blows over the top of a hill

(a) increases atmospheric pressure there.

(b) decreases atmospheric pressure there.

(c) doesn't affect atmospheric pressure there.

(d) brings atmospheric pressure to zero.

To determine

The correct option for the statement “Wind speeding up as it blows over the top of a hill".

Answer to Problem 10RAT

The correct option for the statement “Wind speeding up as it blows over the top of a hill" is option (b).

Explanation of Solution

When the wind blows over the top of the hill, it has a lesser area to flow. Due to this, the wind speed becomes more at the top of the hill.

The higher wind speed results in a decrease in the air or atmospheric pressure because the air particles move away from a particular place. The momentum of moving air is converted in static atmospheric because the air mass is slow down. This implies that the higher airspeed decreases the atmospheric pressure readings.

As the wind blows over the top of a hill, it results in a decrease in atmospheric pressure there.

Conclusion:

Therefore, the correct option for the statement “Wind speeding up as it blows over the top of a hill" is option (b).