Which of the following statements gives the main reason that night-time radio broadcasts can be sent over long distances?
A)Radio waves propagate more efficiently through cooler, high-density air.
B)Radio stations put out more power at night.
C)The low D-level region of the ionosphere is weaker at night.
D)There is less interference because many radio stations do not broadcast at night.

Question

Quizplus · Accepted Answer

The low D-level region of the ionosphere, located roughly 50 to 90 kilometers above Earth's surface, is weaker at night than during the day because it is not charged by sunlight. This region is responsible for reflecting certain wavelengths of radio waves back to Earth, allowing them to travel longer distances. So, by being weaker at night, it allows radio waves to travel further, making night-time radio broadcasts capable of reaching more distant locations.

Which of the Following Statements Gives the Main Reason That