PRACT_THOMSON

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LABORATORIO DE QUÍMICA SEMESTRE 2014-2 GRUPO 09 PRÁCTICA 3. EXPERIMENTO DE J. J. THOMSON Objetivos: 1. Conocerá el principio de funcionamiento del aparato para la determinación de la relación entre la carga y la masa (q/m) de los rayos catódicos, su manejo y las precauciones que deben observarse al utilizarlo. 2. Determinará experimentalmente el valor de la relación q/m de los rayos catódicos. 3. Determinará el error experimental de la relación q/m de los rayos catódicos. ACTIVIDAD 1. TOMA DE MEDICIONES. I [A] Θ [cm] 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 r [cm] ACTIVIDAD 2. CÁLCULO DE LA PENDIENTE. Expresión Matemática: ଶ௏൫ I 2 [A 2 ] x = I -2 [A -2 ] r [m] Y = r 2 [m 2 ] ݎ 2ܸ ቀ 5 4 ܽ ܰ ߤ ݍ ݉ . 1 ܫ Por mínimos cuadrados: ݉ ൌ 2ܸ ቀ 5 4 ܽ ܰ ߤ ݍ ݉ Donde: m = pendiente = ____________________________ b = ordenada en el origen = ____________________
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