How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better? a) the metal or plastic of the megaphone cannot absorb the sound waves. b) the inside of the megaphone is like a vacuum because its shape eliminates air pressure. c) the air pressure is greater inside the megaphone than outside and the sound waves are able to travel further. d) solid objects can change the direction of sound waves; megaphones allow users to determine the general direction of the sound.

A megaphone used by a cheerleader can allow people on the opposite side of a field to hear her better because;

D. Solid objects can change the direction of sound waves; megaphones allow users to determine the general direction of the sound.

Determination of the general direction of the sound lessens its dispersion and  thus, it reaches the observers at a higher intensity, hence it being louder.

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.