# Exp Solution - 36th International Physics Olympiad Salamanca(Espaa 2005 R.S.E.F PLANCKS CONSTANT IN THE LIGHT OF AN INCANDESCENT LAMP SOLUTION TASK

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36 th International Physics Olympiad. Salamanca (España) 2005 Exp. Page 1 of 9 R.S.E.F. PLANCK’S CONSTANT IN THE LIGHT OF AN INCANDESCENT LAMP SOLUTION TASK 1 Draw the electric connections in the boxes and between boxes below. Pm B V A P Photoresistor Incandescent Bulb Potentiometer Red socket Black socket Ohmmeter Voltmeter V Ammeter A Platform P Potentiometer Pm Battery B

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36 th International Physics Olympiad. Salamanca (España) 2005 Exp. Page 2 of 9 R.S.E.F. TASK 2 a) t 0 = 24 ºC T 0 = 297 K T 0 = 1 K b) V /mV I / mA R B / 21.9 30.5 34.9 37.0 40.1 43.0 47.6 51.1 55.3 58.3 61.3 65.5 67.5 73.0 80.9 85.6 89.0 95.1 111.9 130.2 181.8 220 307 447 590 730 860 960 1.87 2.58 2.95 3.12 3.37 3.60 3.97 4.24 4.56 4.79 5.02 5.33 5.47 5.88 6.42 6.73 6.96 7.36 8.38 9.37 11.67 13.04 15.29 17.68 19.8 21.5 23.2 24.4 11.7 11.8 11.8 11.9 11.9 11.9 12.0 12.1 12.1 12.2 12.2 12.3 12.3 12.4 12.6 12.7 12.8 12.9 13.4 13.9 15.6 16.9 20.1 25.1 29.8 33.9 37.1 39.3 V min = 9.2 mV * * This is a characteristic of your apparatus. You can´t go below it. We represent R B in the vertical axis against I .
36 th International Physics Olympiad. Salamanca (España) 2005 Exp. Page 3 of 9 R.S.E.F. In order to work out R B0 , we choose the first ten readings. TASK 2 c) V /mV I / mA R B / 21.9 ± 0.1 30.5 ± 0.1 34.9 ± 0.1 37.0 ± 0.1 40.1 ± 0.1 43.0 ± 0.1 47.6 ± 0.1 51.1 ± 0.1 55.3 ± 0.1 58.3 ± 0.1 1.87 ± 0.01 2.58 ± 0.01 2.95 ± 0.01 3.12 ± 0.01 3.37 ± 0.01 3.60 ± 0.01 3.97 ± 0.01 4.24 ± 0.01 4.56 ± 0.01 4.79 ± 0.01 11.7 ± 0.1 11.8 ± 0.1 11.8 ± 0.1 11.9 ± 0.1 11.9 ± 0.1 11.9 ± 0.1 12.0 ± 0.1 12.1 ± 0.1 12.1 ± 0.1 12.2 ± 0.1 0 10 20 30 40 50 0 5 10 15 20 25 30 I /mA R /ohmios

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36 th International Physics Olympiad. Salamanca (España) 2005 Exp. Page 4 of 9 R.S.E.F. Error for R B (We work out the error for first value, as example). 1 . 0 87 . 1 01 . 0 9 . 21 1 . 0 71 . 11 2 2 2 2 = + = + = I I V V R R B B We have worked out R B0 by the least squares.
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## This note was uploaded on 11/08/2011 for the course PHYS 0000 taught by Professor Na during the Spring '11 term at Rensselaer Polytechnic Institute.

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Exp Solution - 36th International Physics Olympiad Salamanca(Espaa 2005 R.S.E.F PLANCKS CONSTANT IN THE LIGHT OF AN INCANDESCENT LAMP SOLUTION TASK

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