The sound heard following reflections from a hard surface such as a cliff or a wall is known as an echo. The time is taken to hear the echo will be 0.5 seconds.
The repeated same voice heard by the person when the voice is reflected from hard surfaces such as the wall is known as the echo.
Dolphins utilize the echo to identify for navigation. Sonar is a similar concept. Submarines use sonar teqnique.
speed of sound wave = 320 m/sec
distance from the reference = 80 m
as we know that
Distance = speed × time
[tex]\rm Time=\frac{Distance}{Speed}[/tex]
[tex]\rm Time=\frac{80}{320}\\\\ \rm Time=0.25 sec.[/tex]
The total time to hear the echo will be twice the time travel on one side.
Total time = 2× 0.25
Total time = 0.5 sec
Hence the time is taken to hear the echo will be 0.5 seconds.
To learn more about echo refer to the link;
https://brainly.com/question/9028662
