Answer:
a and d are correct answer
hope it is helpful to you
Wood, plastic, rubber and air are good insulators because they don’t have free electrons.
The velocity of sound in at 300C is 511.3 m/s.
Explanation:
The equation that gives the speed of sound in ar as a function of the air temperature is the following:

where
T is the temperature of the air, measured in Celsius degrees
In this problem, we want to find the speed of sound in ar for a temperature of

Substituting into the equation, we find:

So, the velocity of sound in at 300C is 511.3 m/s.
Learn more about sound waves:
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The <span>Atomic theory that states that atoms have three fundamental parts, and that electrons orbit the nucleus is the kinetic molecular theory of gases.</span>