Why Is 686 m/s Incorrect in Physics Calculations?

[Bruh23]

Homework Statement

You are standing at some distance from a rocky cliff and shout loudly. You hear the echo 2 seconds later. How far is the rocky cliff? Take the speed of sound in air as 343 m/s and round off your answer to the nearest integer (whole number).

Relevant Equations

v = Distance/Time

I brought time over to the other side and multiplied to get 686 m/s but that wasn't correct

 

[phinds]

Show your work

 

[Bruh23]

v = D/T
v*T = D/T*T
343 m/s * 2s = D
D = 686 m

 

[kuruman]

686 m is the distance sound travels in 2 seconds. Are you 686 m away from the point where you produced the sound when you hear the echo?

 

[DaveC426913]

You are doing math blindly, without consideration for context. There is a reason they've told you you're facing a rocky cliff.

Or, more simply: you have not actually answered the question asked. What is the question that was asked?

 

[nasu]

Why the "Physics of light and sound"?

 

[DaveC426913]

Why the "Physics of light and sound"?

Likely the name of the chapter OP is studying.

 

[DaveC426913]

Can we conclude that you figured it out?

 

[berkeman]

Why the "Physics of light and sound"?

It refers to how the OP likes to dress when studying Physics. See their Avatar...