Answer a) is incorrect as sound does not travel in a vacuum.
The change in temperature is simply 50 / (9/5) = 27.777. We just throw out the 32 from the formula
The frequency of the wave is 132 Hz
Explanation:
To calculate the speed of the wave, we can use the following formula:

where
d is the distance travelled by the wave
t is the time elapsed
For the sound wave in this problem, we have:
d = 660 m is the distance travelled
t = 2 s is the time interval considered
Substituting and solving for v, we find the speed of the sound wave:

Now we can calculate the frequency of the wave by using the wave equation:

where
v = 330 m/s is the speed of the wave
is the wavelength
f is the frequency
Solving for f, we find:

Learn more about wavelength and frequency:
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Insulators are the materials that are bad conductors of heat/electricity.insulation is tge pricess of covering any thing with such materials in order to prevent heat or electricity.