Physics

Problem

Three exoplanets emit approximate blackbody spectra with peak wavelengths

\lambda_P=12\,\mu\text{m}

\lambda_Q=8\,\mu\text{m}

, and

\lambda_R=16\,\mu\text{m}

. Which ordering lists the planets from hottest to coldest? a)

Q \;>\; R \;>\; P

R \;>\; P \;>\; Q

Q \;>\; P \;>\; R

P \;>\; Q \;>\; R