Question 3 or ques 4 answer plzz
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3.a. there should be a minimum distance of 17m between the source of sound reflecting body.
3.b. Bats have a keen sense of hearing, which guides them to catch their prey. They make a series of twittering sound, so high pitched that the human ear cannot hear. These sound waves strike against in their path of flight and send echoes to the bat 's ears to catch their prey.
3.b. Bats have a keen sense of hearing, which guides them to catch their prey. They make a series of twittering sound, so high pitched that the human ear cannot hear. These sound waves strike against in their path of flight and send echoes to the bat 's ears to catch their prey.
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