Question

1 Fill in the blank.
1- The device used to measure rhe depth of sea is called_______ .

2-For hearing an echo the minimum distance between the source of sound and the_____body is 17 m.
3 -The range of ______vibrations is above 20,000 Hz.
4-The____of the sound produced by a vibrating wire decreases ,if its length is increased.
5-The loudness of sound depends on the extent of_____of a vibrating body.
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Answer 1

Answer:

1) sonar

Explanation:

hope it will help

Answer 2

Answer:

echo sounder. used to measure rhe depth of sea.