As the temperature of a medium increases, the speed of the sound wave
increases because the particles bump into each other more often.
increases because the particles bump into each other less often.
decreases because the particles bump into each other more often.
decreases because the particles bump into each other less often.

Answer : As the temperature of a medium increases, the speed of the sound wave increases because the particles bump into each other more often.  

Explanation :

The dependency of the speed of the sound wave and the temperature of the medium is :

Where

= ratio of specific heat

R is gas constant

T is the temperature

The speed of the wave is directly proportional to the temperature. As the temperature of a medium increase, the speed of the sound increase. The particles start vibrating faster. Hence, they bump into each other.

Hence, the correct option is (A).

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the answer is true. hope it .