A boat is on a trailer out of the water. You are standing next to the boat. The

Question

A boat is on a trailer out of the water. You are standing next to the boat. The pilot starts the engine. The propeller of the outboard motor on the boat generates a noice at 500 Hz. Before the boat is launched (still out of the water) you dive under the water and can still hear the prop noise. At what frequency do you hear the prop noise? The boat is now underwater. You are also underwater. At what frequency do you hear the prop noise?

My answer was that the frequency doesn't change, the only change is the speed of sound because of it coming from different mediums. I just wanted to check my answer to see if I was correct.

Explanation / Answer

in a medium speed and wave length of the sound are same we know the formula v =f* v -is speed of the sound f -is frequency of the sound -is wave length of the particular sound wave when man and boat both are under water   by above formula we can understand frequency of the sound in a medium is not changed   _________________________________________________________________________ when boat is out of the water and man is under water the frequency of the sound at out of the water is fa =500 Hz speed of the sound under water is  vw =1500 m/s at constant wave length v f speed of the sound in air is va=333 m/s frequency of sound heard by man when boat is out of the water and man is under water when boat is out of the water and man is under water is fw/ fa=vw /va fw=(vw /va)* fa    =(1500/333) *500    =2252.2522 Hz fw=(vw /va)* fa    =(1500/333) *500    =2252.2522 Hz

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