Explanation:
The speed of sound in copper, [tex]v_c=3160\ m/s[/tex]
The speed of sound in air at 1.34°C, [tex]v_a=331\ m/s[/tex]
The sound of the blow, traveling through air, reaches the opposite end of the rod 3.18 ms later than the sound transmitted through the rod. Time difference, [tex]\Delta t=3.18\ m/s=3.18\times 10^{-3}\ m[/tex]
Since, [tex]time=\dfrac{distance}{speed}[/tex]
[tex]\Delta t=\dfrac{l}{v_a}-\dfrac{1}{v_c}[/tex]
[tex]3.18\times 10^{-3}=\dfrac{l}{331}-\dfrac{1}{3160}[/tex]
l = 1.17 meters
So, the length of the rod is 1.17 meters. Hence, this is the required solution.
