Question

The temperature in the exosphere may rise upto ?

Answer 1

Hint:The temperature rises with altitude in some layers and drops in others. The heat source of each layer determines the temperature gradient in that layer. The thermal structure of the atmosphere is formed by temperature gradients in the four main layers of the atmosphere.

Complete answer:
Temperatures in the exosphere range from $0$ to over $1700$ degrees Celsius. At night, it's cooler, and during the day, it's even hotter. The exosphere's air is extremely thin, consisting mostly of helium and hydrogen. Due to the distance, the temperature in the exosphere can reach $1600$ degrees Celsius.

The exosphere is the Earth's atmosphere's most outer layer. It begins at a height of approximately $500$ kilometres and extends to a height of approximately $10,000$ kilometres. Within this area, atmospheric particles can travel hundreds of kilometres in a ballistic trajectory before colliding with other atmospheric particles. Exosphere particles escape into deep space.

The thermopause is the lower boundary of the exosphere, where it interacts with the thermosphere. It begins at around $250,000$ km altitude, but its height varies depending on the amount of solar activity. Particles in the atmosphere collide atomically below the thermopause, similar to what happens in a balloon. Above the thermopause, however, this transitions to purely ballistic collisions.

The exosphere's potential maximum limit is $190,000$ kilometres. This is the point at which the Earth's gravitational force on atmospheric particles is reversed by solar radiation from the Sun. This was discovered at a distance of about $100,000$ kilometres from the Earth's surface. The official limit between Earth's atmosphere and interplanetary space is considered by most scientists to be $10,000$ kilometres.

Note: While some scientists believe that the thermosphere is the uppermost layer of our atmosphere, others believe that the exosphere is the true "final frontier" of Earth's gaseous envelope.