With reference to "Coriolis force", which of the following statements is/are correct? 1. It increases with increase in wind velocity. 2. It is maximum at the poles and is absent at the equator. Select the answer using the code given below:
A1 only
B2 only
CBoth 1 and 2
DNeither 1 nor 2
Answer & Solution
Correct answer: C. Both 1 and 2
Answer: C. Both statements about the Coriolis force are correct.
The Coriolis force has magnitude F = 2 m ω v sin(φ), where ω is Earth's angular velocity, v is the velocity of the moving object, and φ is the latitude.
Statement 1 is CORRECT: F is directly proportional to wind velocity v. Faster winds experience stronger Coriolis deflection.
Statement 2 is CORRECT: sin(φ) is 0 at the equator (φ = 0) and ±1 at the poles (φ = ±90°). So Coriolis force is ZERO at the equator and MAXIMUM at the poles. This is why hurricanes do not form at the equator.
Source: NCERT Class 11 Fundamentals of Physical Geography, Ch 10 (Atmospheric Circulation and Weather Systems).
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