Question

Karen claps her hand and hears the echo from

a distant wall 0.519 s later.
How far away is the wall? The speed of
sound in air is 343 m/s.
Answer in units of m.

Answer 1

89 m

Step-by-step explanation:

Applying

v = 2d/t................... Equation 1

Where v = velocity of sound in air, d = distance of the wall from Karen, t = time taken to hear the echo.

make d the subject of equation 1

d = vt/2..................... Equation 2

From the question,

Given: v = 343 m/s, t = 0.519 s

Substitute these values into equation 2

d = (343×0.519)/2

d = 89.01 m.

d ≈ 89 m