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## Homework Statement

An important news announcement is transmitted by radio waves to people who are 81 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 2.3 m from the newscaster. Take the speed of sound in air to be 343 m/s. What is the difference in time that the message is recieved?

## Homework Equations

c = f*lamda

## The Attempt at a Solution

c1 = 3*10^8 m/s

lamda1 = 81km

c2 = 343 m/s

lamda2 = 2.3m

f1 = c1/lamda1

f2 = c2/lamda2

T = 1/(f1-f2) = time difference

What am I doing wrong? Thanks in advance for any help!