What causes the increase in pitch as an ambulance siren moves toward you?

a. the sound waves become compresses

b. the amplitude of the sound waves changes

c. the speed of the sound waves changes

d. the sound waves spread farther apart

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the

In what direction does the medium move relative to the direction of the wave? explain.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?