How does active sonar differ from passive sonar?

Active sonar sends a signal out from a source and when it encounters an object the signal reflects back to the source. This can be detected by the object it is reflecting off of like a ship or...

active transport is when cells must move materials in an opposite direction against concentration gradient. it requires energy. passive doesn't require energy. like a balloon , when u blow it up it...

A transponder makes a sound in the fluid, and the time it takes the return pulse to arrive allows one to determine distance, and the direction the return pulse comes from tells the direction to the...

Active transport requires the cell to use its own energy,while passive transport doesn't.

active transport uses energy and passive transport doesn't