1. 다음 글에서 언급된 ultrasonic sound waves 의 용도와 거리가 먼 것은?

What can you do with ultrasonic sound waves?

Plenty ! One of  their early uses was in locating submarines.

They are still used for the same purpose, but now they are also used to find the depth of the ocean and to locate schools of fish and objects in the deep sea.

A pulse of ultrasound is sent  out into the water, reflected from some object and then received back at the ship. The time taken for the pulse to return is measured and used to calculate the distance of the object from the ship.

1) 잠수함의 위치를 찾아내기

2) 배의 속도를 빠르게 하기

3) 바다의 깊이를 알아내기

4) 어군을 탐지해내기

5) 바다 속 물체와 배 사이의 거리 측정하기