\(t=\dfrac{30,72}{0,09}=\dfrac{1024}{3}\left(s\right)\)
\(\Delta t=\dfrac{1024}{3}-0,09=\dfrac{102373}{300}\left(s\right)\)
\(=>v=s\cdot t=\dfrac{30,72}{\dfrac{102373}{300}}=0,1\left(\dfrac{m}{s}\right)\)
Thời gian truyền trong không khí : \(t=\dfrac{s}{v}=\dfrac{30,72}{340}\approx0,1\left(s\right)\)
Thời gian truyền để bạn be nghe thấy : \(0,1-0,09=0,01\left(s\right)\)
\(v=\dfrac{s}{t}=\dfrac{30,72}{0,01}=3,702\) (m/s)