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.
The correct answer is <span>Wealthy businessmen to run the government like an efficient business.
He believed that running the state was similar to running a business and people who ran successful businesses, which was not difficult in post world war 2 America, should help rule the country because they knew how to manage people and negotiate. </span>
A theory is a hypothesis that is proved to be true through rigorous scientific methods of verfiication, mathematical and scientific arguments. Theories escalate into laws more when found out to be a natural fact. In this case, the answer would have to be A.
I believe that it would be C for this question
