Why does sound travel faster on a rainy day than on a dry day?

Air temperature in the Rajasthan desert can reach 46°C. What is the velocity of sound in air at that temperature? (V₀ = 331 m s^–1)

Mention two cases in which there is no Doppler effect in sound?

The thunder of cloud is heard 9.8 seconds later than the flash of lightning. If the speed of sound in air is 330 m s^-1, what will be the height of the cloud?

An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the transmission and reception of the wave is 1.6 seconds. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m s^-1?