# physical models using mechanics

Jun 16th, 2015
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These questions are about blackbodies. A blackbody is a idealised body that absorbs and reemits light of all wavelengths. Part A. This classic question tests your ability to manipulate basic definitions of force, pressure, power, etc., and your understanding of the particle nature of light.

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Week 6 Elementary Mechanics from Ambrose Yim to be discussed 6thMarchThis week we will focus on the skill of devising physical models using mechanics. It will be apparent why they are relevant to your Oxbridge interview preparation. Complete the questions under Elementary mechanics before coming to the session and be prepared to explain your answers in front of the class.Elementary mechanicsThese questions are aboutblackbodies. A blackbody is a idealised body that absorbs and reemits light of all wavelengths.Part A. This classic question tests your ability to manipulate basic definitions of force, pressure, power, etc., and your understanding of the particle nature of light.Write an expression for the power of a laser emitting N photons per second. What is the intensity of the laser on a black absorbing plate of area A?1. Write an expression for the total momentum transferred per second by the laser to the plate. Hence derive an expression for the pressure on the plate.2. By considering your answers to (a) and (b) derive an expression for photon pressure in terms of intensity.Optional: Part B. You will derive theAmbrose Inequality.1. Calculate the fraction

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