Question

Using Wien’s Law, estimate the wavelength at which these common materials radiate their peak brightness (show your work):

walls at 300 K:   

ice water at 273 K :

hot water at 373 K :   

skin at 310 K:

   An incandescent light bulb at 3000 K

Answer 1

Wien's law is λ max = k / T, where k= 2898 μm K and T= temperature in kelvin

walls at 300 K: is 9.66 μm

ice water at 273 K := 10.61 μm

hot water at 373 K := 7.76μm

skin at 310 K:= 9.34μm

   incandescent light bulb at 3000 K = 0.966 μm

see picture

where k=2898 um K . T= Absolute temperature in mar so, for walls Kelum. 7889 2898 umk 300K & - 9.66 um ice & 273k ) 2898 mmk 273K a 10.61 um hot water - 2898 rok = 7.76m 373K 2898 umk. 28010 9.34 eum 310R Incandescent Ught bulb 2998 unk a 0.9664m 3000K skin