4-21+Morgan+Graham

TPJ April 21, 2009 First thing we did as we walked into the classroom was pick up the handout //__“Interference: Physics 1” pages 10-11.__// Daily Question: A pulse in a higher density medium (like a slinky) is traveling towards a boundary with a lower density medium (like a string). 1. The reflected pulse in the slinky _ __(will, will not) be inverted because__ ___.__ __ The answer is it __will not because we have an open end__.__ 2. The speed of the reflected pulse will be (greater than, less than, the same as) the speed of the incident pulse. __ The answer is __the same as __because the medium doesn’t change.__ __ 3. If the speed of the wave was clocked at 5m/s with a wavelength of 2m, what is the __period__ of the wave? To find the answer to this question you must take the equation V =f * λ, plugging in the 5m/s for the V, and the 2m for the λ. Dividing both sides by 2 making the f= to 2.5. You then take the equation T = 1/f, plugging the value in for f giving us that T = 0.4s. The next thing we did after going over the daily question was taking a look at the handout that was picked up at the beginning of class, stated above. We read through the first set of questions on page 10 “interference: physics 1” and then made our predictions. After then we tested our predictions as a whole class and found that in any transmission of waves they always travel through each other. We then turned the handout over to page 11 “More Notes on Interference” and read till we reached the prediction part and created our predictions. Then once again as a whole class we tested our predictions. As a class we found that all four of the characteristics frequency, speed, wavelength, and amplitude create a change in the transmissions of waves. Assignments: No homework But reminders don’t forget that part 2 of the roll coaster project is due on Friday April 24, 2009.