At a distance of 100 km from a small, electrically charged asteroid, it is found
that there is an electric field of 300 V/m. How much charge does the asteroid
carry?

E = K Q / R^2         electric field due to charge Q

Q = E * R^2 / K = 300 N / C * (10^5)^2 m^2 / (9.0E9 nt-m^2/C^2)

Q = 333 C

Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.