Answer:
![f_{U}= 1019.72hz](https://tex.z-dn.net/?f=f_%7BU%7D%3D%201019.72hz)
Explanation:
From the equation we are told that:
Velocity of French sub ![V_{U}= 43.00km/h](https://tex.z-dn.net/?f=V_%7BU%7D%3D%2043.00km%2Fh)
Velocity of U.S. sub at ![V_{F}|=64.00 km//h](https://tex.z-dn.net/?f=V_%7BF%7D%7C%3D64.00%20km%2F%2Fh)
French Wave Frequency ![F_{F}=1000Hz](https://tex.z-dn.net/?f=F_%7BF%7D%3D1000Hz)
Velocity of wave ![V_{s}=5470 km/h](https://tex.z-dn.net/?f=V_%7Bs%7D%3D5470%20km%2Fh)
Generally the equation for Signal's frequency as detected by the U.S. is mathematically given by
Doppler effect
![f_{U} = \frac{ f_F (vs + v_{U})}{(v_s - v_F) }](https://tex.z-dn.net/?f=f_%7BU%7D%20%3D%20%5Cfrac%7B%20f_F%20%28vs%20%2B%20v_%7BU%7D%29%7D%7B%28v_s%20-%20v_F%29%20%7D)
![f_{U}= \frac{ 1000 x ( 5470+64)}{(5470-43)}](https://tex.z-dn.net/?f=f_%7BU%7D%3D%20%5Cfrac%7B%201000%20x%20%28%205470%2B64%29%7D%7B%285470-43%29%7D)
![f_{U}= 1019.72hz](https://tex.z-dn.net/?f=f_%7BU%7D%3D%201019.72hz)
Energy travels with sound waves.
I think the answer would be A
Answer:
In much the same way, a mechanical wave can carry energy through a medium without moving matter through the medium. ... Because the particles in a solid are tightly packed together, sound waves can quickly transfer energy from particle to particle in a solid.