57.14A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not

an underground lake

Explanation:

I took the test

An underground lake

Hope that helped :D

an underground lake

Explanation:

b

Explanation:

speed of sound wave depends on elasticity of medium and density of medium

it is given by formula

[tex]v = \sqrt{\frac{E}{/rho}}[/tex]

now if wave travel through solid then its speed is maximum while if it travel from gas then its speed is minimum

so initially its speed is given as 4000 m/s and suddenly decrease to 1500 m/s

so here we can say that its medium will change from solid to liquid

so sound will encounter with water

Speed of sound wave depends on the elasticity of medium

It is given by formula

[tex]v = \sqrt{\frac{E}{\rho}}[/tex]

now if we are given that initially sound wave is travelling with speed 4000 m/s

Then its speed becomes 1500 m/s

so here since speed is decreased by large value

so here elasticity must decreased by large amount

A. a different kind of rock

B. an underground lake

C. an open cavity

D. a pile of dinosaur bones

So in above all options the density is changed or decreased by large value if the medium is changed to solid to liquid

So the correct answer will be

B. an underground lake

The Answer is B mate :)

Explanation:

The correct answer is B. An underground lake

Explanation:

Sound moves more slowly in liquids or gases than in solids, in which particles are together. Additionally, the speed of sound is measured in meters per second or m/s. In this context, if the speed of a sound wave reduced from 4,000 m/s to 1,500 m/s while traveling through the surface of Earth, which is solid, it is likely the cause is a change in the medium the wave is going through.

Moreover, the average speed of sound in air is below 400 m/s, this suggests the sound was not traveling through an open cavity. However, the speed in liquids such as water is around 1480 m/s, this is quite similar to the second speed registered. According to this, the sound wave slowed because it was traveling through a liquid medium; therefore, the answer is an underground lake.

an underground lake

In general, sound (mechanical waves) travels faster in solids than in liquids, and faster in liquids than in gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).  

In other words: The speed of sound varies depending on the medium through which the sound waves travel.  

So, if we are told the sound wave initially had a speed of 4,000 m/s and it suddenly decreases to 1,500 m/s, this means the sound waves passed from a solid medium to a liquid medium.

Hence, the correct option is: an underground lake.

an underground lake

Explanation:

In general, sound (mechanical waves) travels faster in solids than in liquids, and faster in liquids than in gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).

In other words: The speed of sound varies depending on the medium through which the sound waves travel.

So, if we are told the sound wave initially had a speed of 4,000 m/s and it suddenly decreases to 1,500 m/s, this means the sound waves passed from a solid medium to a liquid medium.

Hence, the correct option is: an underground lake.