The 488 nm line from an argon ion laser is doppler broadened to 2.7×109 hz. given that the laser’s mirrors are 1 m apart, determine the number of longitudinal modes within the gain bandwidth of the 488 nm line. assume that the index of refraction of the gas is 1

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.