# The Physics of Light and Sound

• Bruh23

#### 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

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

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?

Bruh23
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?

Bruh23
Why the "Physics of light and sound"?

berkeman
nasu said:
Why the "Physics of light and sound"?
Likely the name of the chapter OP is studying.

Can we conclude that you figured it out?

nasu said:
Why the "Physics of light and sound"?
It refers to how the OP likes to dress when studying Physics. See their Avatar...

phinds