Physics

Problem

A hollow spherical cavity behaves like a blackbody. At

900\,\text{K}

its surface area is

A

and it radiates

150\,\text{W}

. The area is then increased to

1.10A

while keeping the radiated power the same at

150\,\text{W}

. What is the new temperature of the cavity? a)

920\,\text{K}

820\,\text{K}

879\,\text{K}

860\,\text{K}