STEFAN'S LAW

Establish Newton's Law of Cooling from Stefan-Boltzman law.

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Stefan-Boltzman's Law|Questions

(a) State Newton's law of cooling. (b) Derive Newton's law of cooling from Stefan's law,. (c) What is the limitation of Newton's law ? (d) Derive the shape of the cooling curve of a hot body using Newton's law of cooling.

What is Newton's law of cooling? How it can be derived from Stefan's Boltzman law?

If each square metre, of sun's surface radiates energy at the rate of 6.3xx10^(7) jm^(-2) s^(-1) and the Stefan's constant is 5.669xx10^(-8) Wm^(-2) K^(-4) calculate the temperature of the sun's surface, assuming Stefan's law applies to the sun's radiation.

State Stefan's law and Wien's displacement law. Draw graphs showing the distribution of energy in the spectrum of a black body. Explain what quantity is plotted against the wavelength . By considering how this energy distribution varies with tempaerature expalin the colour changes which occur when a piece of iron is heated from cold to near the melting point.