There are several variations of resonance laboratory activities used to determine the speed of sound. This is not one of them. This activity uses the resonance tube idea to teach resonance, not to verify the speed of sound. Prior to this activity, the speed of sound has already been measured using computer sound-sensors and timing echoes produced in long tubes like carpet tubes. There are other methods to determine the speed of sound. Some methods are referenced at the end of this article. The students already know the speed of sound when they are confronted with data that contradict their prior knowledge. Here, the mystery is something the students solve with the help of a series of demonstrations by the instructor.
1993. Effects of heat processing on digestible energy and other nutrient digestibilities of full-fat soybeans fed to weaner, grower and finisher pigs. Can. J. Anim. Sci. 73: 4ll-419. The influence of different heat treatments for ful1-fat soybeans (FFSB) on digestible energy (DE) values and fecal nutrient digestibilities was studied using 180 castrated male Landrace pigs at three different growth stages: weaner (17.1 t 0.2 kg), grower (32 t 0.2 kg) and finisher (61.6 t 0.3 kg). The soybean products used in weaner (30%), grower (25%) and finisher (20%) diets were soybean meal (SBM) or FFSB processed by either extrusion (Ex) , jet sploding (Js), micronization (Mi) or roasting (Ro). Digesti-bilities were determined by total fecal collections during the last 7 d of each 12-d period. Dry matter (DM) and neutral detergent fiber (NDF) digestibilities oT FFSB were lower (P < 0.05) in weaner than in grower or finisher pigs, but DE values and apparent digestibilities of crude protein (CP) and ether extract were not influenced by growth stage. Extruded FFSB had a superior CP digestibility than the other soybean products (86.4 vs. '79.8,'79.8,80.0 and 78.2% for Js, Mi, Ro and SBM, respectively), and it also had a higher DE value (21.0 vs. 20.0, 19.6, 18.5 and 16.6 MJ DE kg-' DM. P < 0.05). Extrusion of FFSB was most beneficial for weaner pigs as this heat treatment resulted in higher (P < 0.05) CP (87.8 vs. 80.9, 80.8, 82.1 and 76.6% for Js, Mi, Ro and SBM, respectively) and NDF (76.2 vs. 62.7,63.3, 61.9 and 53.8 % for Js, Mi, Ro and SBM, respectively) digestibilities. The heat treatments did not influence the CP and NDF digestibilities during grower or frnisher stages. The data suggested that extrusion of FFSB yielded superior DE values and CP digestibilities than other heat treatments. Marty, B. J. et Chavez, E. R. 1993. Effets du traitement thermique sur la digestibilit6 de l'6nergie et des autres nutriments du soja non d6graiss6 chez des porcelets sevrtis, des porcs en croissance et des porcs en finition. Can. J. Anim. Sci. 73: 4ll-419. L'influence de divers traitements thermiques du soja entier, non d6graiss6 (SND) sur 1'6nergie digestible (ED) et sur la digestibilit6 des nutriments a 6t6 6tudi6e sur 180 castrats Landrace ir trois stades de croissance: post-sevrage (17 X 0,2 kg), croissance (32 + 0,2 kg) et finition (61,6 t 0,3 kg). Le soja utilis6 dans les trois r6gimes, dans les proportions respectives de 30, 25 et20%, consistait en tourteau (TS) ou en SND trait6 par extrusion (EX), jet sploding (Js) ou 6clatement, microuisation (Mi) ou torr6faction (TO). La digestibilit6 6tait mesur6e ir partir de la collecte int6grale des fdces durant les 7 derniers jours de chaque p6riode de 12 jours. La digestibilit6 de la matidre sbche et de la fibre d6tergente neutre (NDF) du SND 6tait moins bonne (P < 0,05) pour les porcelets sevr6s que pour les porcs en croissance ou en finition, mais les valeurs ED et la digestibilit6 apparente de la prot6ine brute (PB) et de I'extrait ir l'6ther n'6taient pas touch6es par le stade de croiss...
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