4-29-09

Graded DQ Review DQ/ HW Standing Waves Prelab

Mr. Manning has a half sheet of paper and a worksheet called "the Speed of wave lab." Then we did the graded DQ. The graded DQ asked, the sound wave produced with a frequency of 440 Hz in the air. If the wave length is .75 meters, what is the air's temperature? After he collected the paper from everyone, he went over the answer. The speed is equal to 440Hz times .74 meters= 330 m/s. the Vsound is equal to 331 m/s @ 0 degrees C. 331 m/s - 330 m/s= 1 m/s. The temperature is equal to -1.67 degrees C. Taylor became confused on how Mr. Manning found the temperature. He then went over how he found the answer. After we went over the DQ, we went over our homework. He showed us how to do number 5. We take 384-331 which equals 53. Then we divide that by .6 which gives us 88 degrees C. He then showed us pulses with standing waves. He showed us the the pulse moving at a medium speed. We went to the back of the classroom to see Mr. Manning show us the different pulses with the slinky. He showed us the up to four harmonics. Even Taylor tried to make a harmonic. After that we had to make a chart filling in the harmonics.