Acube at 101 °c radiates heat at a rate of 67 j/s. if its surface temperature is increased to 166 °c, the rate at which it will now radiate is closest to

The rate at which it will radiate heat is closest to 127.2J.

Explanation:

According to Stefan's law, the heat radiated by a black body can be written as:

is directly proprtional to the  .

where H is the amount of heat radiated and T is the surface temperature .

Example : The heat is transferred by radiation and an example of heat transferred by radiation is the sunlight reaching earth from sun.

Note : Here the temperature is expressed in Kelvin.

.

The rate at which it will radiate heat is closest to 127.2J.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.