A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the Earth’s surface. What has the sound wave most likely encountered? (Its B) A. a different kind of rock B. an underground lake C. an open cavity D. a pile of dinosaur bones

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.

UNDERGROUND LAKE

Explanation:

the correct answer is korematsu was not a spy but could not be granted equal rights.

in the supreme cout’s decision in korematsu v. the united states, the court said that korematsu was not a spy but could not be granted equal rights.

the court voted 6 to 3, and the decision was written by justice black. the decision was that the evacuation order that the citizen korematsu had violated was valid. it was found that the order had no racial intentions. the order was a valid measure to keep the united states safe during war times, especially the pacific west.

the options of the question were, a) was not a spy and deserved equal rights. b) was not a spy but could not be granted equal rights. c) was a spy and should be imprisioned immediately. d) was spy but was free to go back to japan.

the end of the gilded age coincided with the panic of 1893, a deep depression, which lasted until 1897 and marked a major political realignment in the election of 1896. this productive but divisive era was followed by the progressive era.