# Homework Help: Speed of sound in air

1. Jan 19, 2016

### Sace Ver

1. The problem statement, all variables and given/known data
A student stands 86m from the foot of a cliff, claps her hands, and hears the echo 0.50s later. Calculate speed of sound in air.

Known
•86m
•0.50s

2. Relevant equations
V=331.4+0.606T

3. The attempt at a solution
V=d/t
V=86m/0.50s
V=172m/s

Is that the first step to the problem? If so I'm not quite sure what the next step is.

2. Jan 19, 2016

### Samy_A

What is the total distance the sound has to travel between the moment she claps her hand and the moment she hears the echo?

3. Jan 19, 2016

### stockzahn

Your formula is correct, but the value of the distance you used isn't.

4. Jan 19, 2016

### Sace Ver

86m x 2 = 172 bc it is an echo?

V=d/t
V=172m/0.50s
V=344m/s

5. Jan 19, 2016

### stockzahn

That seems to be correct - about 340 m/s is a typical value for the speed of sound of air at atmospherical conditions. I also think that this is the only step of the calculation (at least according to the statement).