Black body radiation experiment

[nick7]

Homework Statement

im at the point where i ve to plot graphs of intensity versus wavelenght of a tungsten lamp for different temperatures.i ve calculated corectly the temperature and the wavelenghts..after that i took Planck s formula to find the corresponding intensity for each wavelenght and ploted the graph which is wrong!for a different temperature and same wavelenghts i repeated the proccedure by only changing T in the below formula

Homework Equations

p=8πhc/λ^5(exp(hc/λkT)-1) :planck s formula i used,,where is my mistake?for λ i substituded e.g 412*10^(-9)m and so on,and T in kelvin e.g 2978 k

The Attempt at a Solution

 

[jbsteele]

The mistake is in substituting the values. Planck's formula needs to be in terms of wavelength and temperature, so you need to substitute in the wavelength and temperature in the appropriate units. The values should be in meters for wavelength and Kelvin for temperature.