Experiment_Solution - 39th International Physics Olympiad -...

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Unformatted text preview: 39th International Physics Olympiad - Hanoi - Vietnam - 2008 Experimental Problem / Solution Solution Task 1 1. 1.1. 25 1 o T = C ( ) samp V T = 573.9 mV With different experiment sets, may differ from the above value within 40 mV. samp V Note for error estimation: V V and are calculated using the specs of the multimeter: 0.5% reading digit +2 on the last digit. Example: if V = 500mV, the error V = 500 0.5% + 0.2 = 2.7 mV 3 mV. ( ) 574 3 mV samp V T = Thus, . ( ) samp V T All values of within 505 585 mV are acceptable. 1.2. Formula for temperature calculation: samp samp ( ) ( ) V V T T T = From Eq (1): ( ) o samp 50 C V = 523.9 mV ( ) o samp 70 C V = 483.9 mV ( ) o samp 80 C V = 463.9 mV ( ) ( ) samp samp V V T T T = + Error calculation: Example: = 495.2 mV , then samp V samp 2 7 0 03 50 25 3 45mV 3 5mV . . ( ) . . V = + = Thus: ( ) o samp 50 C V = 524 4 mV ( ) o samp 70 C V = 484 4 mV 1 39th International Physics Olympiad - Hanoi - Vietnam - 2008 Experimental Problem / Solution ( ) o samp 80 C V = 464 5 mV The same rule for acceptable range of as in 1.1 is applied. samp V 2. 2.1. Data of cooling-down process without sample: t (s) V V (mV) ( 0.2mV) (mV) ( 3mV) samp 0 492 -0.4 10 493 -0.5 20 493 -0.5 30 494 -0.6 40 495 -0.7 50 496 -0.7 60 497 -0.8 70 497 -0.8 80 498 -0.9 90 499 -1.0 100 500 -1.0 110 500 -1.1 120 501 -1.1 130 502 -1.2 140 503 -1.2 150 503 -1.3 160 504 -1.3 170 504 -1.4 180 505 -1.5 190 506 -1.6 200 507 -1.6 210 507 -1.7 220 508 -1.7 230 508 -1.8 240 509 -1.8 250 509 -1.8 260 510 -1.9 270 511 -1.9 2 39th International Physics Olympiad - Hanoi - Vietnam - 2008 Experimental Problem / Solution 280 512 -1.9 290 512 -2.0 300 513 -2.0 310 514 -2.1 320 515 -2.1 330 515 -2.1 340 516 -2.1 350 516 -2.2 360 517 -2.2 370 518 -2.3 380 518 -2.3 390 519 -2.3 400 520 -2.4 410 520 -2.4 420 521 -2.5 430 521 -2.5 440 522 -2.5 450 523 -2.6 460 523 -2.6 The acceptable range of V is 40 mV. There is no fixed rule for the change in V with (this depends on the positions of the dishes on the plate, etc.) T 2.2. Graph 1 490 500 510 520 530 100 200 300 400 500 t [s] V samp [mV] 3 39th International Physics Olympiad - Hanoi - Vietnam - 2008 Experimental Problem / Solution The correct graph should not have any abrupt changes of the slope....
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Experiment_Solution - 39th International Physics Olympiad -...

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