Question

1. after sending out a signal, sonar technology listens for a certain period of time and registers the ___, or reflections of the pulse.

o transverse wave
o echoes
o decibels
o amplitude

1. the time it takes for sonar signals to reflect back is translated into distance using a calculation based on how fast sound travels in water of that ___.

o salinity
o temperature
o pressure
o density

Explanation:

1. Sonar technology listens for echoes which are the reflections of the pulse it sends out. Transverse waves are a type of wave motion not related to sonar reflections. Decibels measure sound - level and amplitude is the maximum displacement of a wave.
2. The speed of sound in water depends on its temperature. Salinity, pressure and density also affect the speed of sound in water but temperature has a more significant and direct impact on the speed of sound used in sonar distance - calculations.

Answer:

1. B. echoes
2. B. temperature