Topic 4: Unit-5

Question 1

What is the thermosphere?

Answer 1

The fourth layer of the atmosphere, located above the mesosphere, extending from about 85 km to 350 km above Earth.

Question 2

How does temperature change in the thermosphere?

Answer 2

Temperature increases dramatically with altitude, reaching up to 2,500°C (4,500°F) or higher due to the absorption of high-energy solar radiation.(in the lower thermosphere)

Question 3

Why does the thermosphere feel cold despite high temperatures?

Answer 3

Even though temperatures are extremely high, the air is so thin that there aren’t enough molecules to transfer heat, making it feel cold to humans.

Question 4

What happens to air density and atmospheric pressure in the thermosphere?

Answer 4

Air density and pressure are extremely low, as the thermosphere contains only a small number of gas molecules that are spread far apart.

Question 4

What is the ionosphere, and how does it affect radio waves?

Answer 4

The ionosphere is a part of the thermosphere that contains charged particles (ions). It helps reflect and transmit radio waves, allowing long-distance radio communication by bouncing signals back to Earth.

Question 5

Why is the thermosphere important for satellites?

Answer 5

The thermosphere is where many satellites and the International Space Station (ISS) orbit because of its low air resistance and stable conditions.