Star a Has a Radius of 200 000 Km and a Surface

question 60

Short Answer

Star A has a radius of 200 000 km and a surface temperature of 6 000 K. Star B has a radius of 400 000 km and a surface temperature of 3 000 K. The emissivity of both stars is the same. What is the ratio of the rate of energy radiated by Star A to that of Star B?

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Definitions:

Endodermis

The innermost layer of cells in the cortex of a plant root, serving as a selective barrier that regulates the passage of substances from the soil into the vascular cylinder.

Sieve Tube

Sugar-conducting tube of phloem; consists of stacked sieve elements.

Pressure Gradients

A physical quantity that represents the direction and rate at which pressure changes in a particular direction.

Evaporation

The process by which water changes from a liquid to a vapor or gas, a key component of the Earth's water cycle.