Why does sound travel faster in hot summer days than in cold winter days?

sound

Many of us have experienced the speed of sound is faster in summer than in winter. Do you know why it happens or how it happens? Here is the small and easy explanation for the above phenomenon. 

First, let us discuss what is sound and how it travels? 
Sound is the reception of waves and their perception by the brain. We are able to hear sound waves whose frequency is between 20Hz to 20,000Hz. The sound waves having a frequency below 20Hz are known as an infrasonic sound and above 20000Hz are known as Ultrasonic sounds.

Enough introductions let us come to the question. Why does it happen?
Sound waves travel faster in hot summer days than in cold winter days because the Kinetic Energy of the air molecules is higher due to the presence of high temperatures.
Also, the velocity of sound waves is directly proportional to the square root of its absolute temperature in air i.e.  V=root( pRT)
This provides the air molecules to move faster and hence the sound waves are transferred more quickly, in other words, the sound waves refract from warm air to the cold air.
Therefore Sound travels faster in hot summer days than in cold winter days.

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