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.

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ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'