Physics

Problem

A metal sphere behaves like a blackbody whose emission spectrum peaks at 2.0

\mu

m when its surface temperature is 1200 K. After cooling, its temperature is 800 K. Which value is closest to the new peak wavelength? a)

1.3\,\mu\text{m}

4.5\,\mu\text{m}

3.0\,\mu\text{m}

2.0\,\mu\text{m}