Question

A sound wave is emitted into the water from the bottom of a boat. What will happen to the sound wave as it travels through the water?
A. It will slowly lose energy to the water around and become weaker the farther it goes

B. It will absorb thermal energy from the water and speed up until it reaches a maximum speed

C. It will continue along its original path at the same speed idefinitly.

D. It will not travel more than 10 m due to the density of water

Answer 1

It is is A but i could be wrong

Answer 2

Answer:

A. It will slowly lose energy to the water around and become weaker the farther it goes

Explanation:

Speed of sound in a medium

c = √(K/ρ)

K is the elastic bulk modulus and ρ is the density

For water

K = 2.2 GPa

ρ = 997 kg/m³

c = √(2.2×10⁹/997)

c = 1485.46 m/s

For material of boat (say steel)

K = 167 GPa

ρ = 8050 kg/m³

c = √(167×10⁹/8050)

c = 4554.71 m/s

Here it can be seen the speed in solid is faster than in water so sound will lose energy when it passes through water.