آزمايش تابش جسم سياه(Black body radiation Exp)

آزمایش تابش جسم سیاه(Black body radiation Exp)
Model 2-1

Modern Experiments

هدف آزمایش:

تحقیق قانون استفن – بولتزمن و قوانین لامبرت در مورد تابش جسم سیاه

وسائل آزمایش:

کوره الکتریکی + میزچه کوره ، دیمر و دماسنج دیجیتال ، میزچه اپتیکی ۲ عدد ، دیافراگم سردکننده ، جسم سیاه ، دیافراگم متغیّر ، ترموپیل (Moll) ، گیره مدرّج ، پایه v شکل بزرگ ۲ عدد ، گیره چندمنظوره ۴ عدد ، میکرو ولتمتر ، سیم رابط BNC – فیشدار

:Descriptions

Investigation of Stefan-Boltzmann’s law and Lambert laws of black body radiation. Measuring the radiant intensity of a blackbody as a function of temperature. The total radiant power M_B of a black body increases in proportion to the forth power of its absolute temperature T (Stefan-Boltzmann’s law). M_B = s .T^۴ ; s = 5.67 * 10^-۸ Wm^-۲K^-۴(Stefan-Boltzmann’s constant). For all other bodies the radiated power M is less than that of the black body, and depends on the properties of the surface of the body. The emittance of the body is described by the relationship e = M/M_B ; M: radiant power of body. In the experiment, a cylindrical electric oven with a burnished brass cylinder is used as a “black body”. The brass cylinder is heated in the oven to the desired temperature between 300 and 750 K. A thermocouple is used to measure the temperature. A water-coolable diaphragm is positioned in front of the oven to ensure that the setup essentially measures only the temperature of the burnished brass cylinder. The measurement is conducted using a Moll’s thermopile; its output voltage provides a relative measure of the radiated power M. The thermopile can be connected either to an amplifier