Find the approximate temperature of a red star that emits light with a wavelength of maximum emission of 700 nm (deep red).
-
Apply Wien's law: λ = 3x10^7 /T
wavelength: λ in Angstrom units(1 A = 10^-10 m)=> 700 nm = 7000 A
temperature: T in Kelvin units
T = 3x10^7 / 7000 = 0.0428 x10^7 = 4285.7 K
wavelength: λ in Angstrom units(1 A = 10^-10 m)=> 700 nm = 7000 A
temperature: T in Kelvin units
T = 3x10^7 / 7000 = 0.0428 x10^7 = 4285.7 K