The filament temperature of a light bulb is 1500 K when the bulb delivers 60 W of power. If its emissivity remains constant, what power is delivered when the filament temperature is 2000 K?

The power delivered when the filament temperature is 2000 K is  189.63 W.

Explanation:

Given;

initial temperature of the light bulb, T₁ = 1500 K

initial power delivered, P₁ = 60 W

Final temperature, T₂ = 2000 K

Final power delivered, P₂ = ?

Apply Stefan-Boltzmann law of radiation;

Therefore, the power delivered when the filament temperature is 2000 K is  189.63 W.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.