Playing Physics Interrobang #6 Sound

Playing Physics Interrobang #6 Sound

1. lllustrate all of the Physics Principles regarding Sound described on the next slides.

1) Create an original MS PowerPoint animation to show how the movements of a tuning fork create sound waves which can be described by sine waves as well as by spherical waves. In other words, create an animation that clearly shows the connection between Figures 1.1, 1.2 and 1.. You must an original PowerPoint for your team, not copy from another team.

2) Demonstrate how the speed of sound depends on the medium in which sound travels. Include all three states of solid, liquid and gas mediums. More points for live demonstration compared to video of a team demonstration. More points for creativity. ) Demonstrate the Doppler Effect for sound. More points for live demonstration compared to video of a team demonstration. More points for creativity.

4) Demonstrate how to calculate the intensity of sound using the formula for Intensity of a Spherical Wave. Select an original and real scenario you have witnessed in which there was intense sound. Estimate the amount of power the sound source generated in making the sound (use credible sources for your estimate); then calculate the sound tensity in watts per square meter as well as decibels for your scenario. More points if you create a live demo (replicating your scenario as much as possible) using low to moderate sound levels in the classroom. Use smartphone apps to analyze the sound intensity of your live demo and compare it to your calculations for sound intensity; find the % difference.

5) Demonstrate the three principles of Forced Vibrations, Natural Frequency and Resonance using a musical instrument. More points for live demonstrations as opposed for video of a demo. 6) Create an additional demonstration of the three related principles of Forced Vibrations, Natural Frequency and Resonance using objects that are NOT musical instruments. More points for finding non-obvious objects in home, school or neighborhood which clearly demonstrate these three principles.

7) Use a stringed instrument, musical or contrived, to explain what is the fundamental frequency of a standing wave on a vibrating string. Then, show how to calculate the fundamental frequency if given the speed of the sound wave and the string length. 8) Use a stringed musical instrument to explain what a harmonic series means and then demonstrate how the fundamental frequency sounds compared to the second and third harmonic.

9) Use a wind instrument, musical or contrived, that is open at both ends to demonstrate harmonics and then show how to calculate the first three harmonics of this wind instrument. 10) Use a wind instrument, musical or contrived, that is open at only one end to demonstrate harmonics and then show how to calculate the first three harmonics of this wind instrument. For both 9) and 10) Assume speed of sound air is 45 m/s. Extra points for creative wind instruments of your own creation.

11) Find the relative intensity of the first three harmonics of your favorite musical instrument and compare it to that of the tuning fork. Make a simple chart similar to Figure.7 to compare the two. 12) Use a musical instrument or sound maker of your choice to demonstrate and explain how sound waves of similar frequences produce beats and how the number of beats per second reflects the difference between the two frequencies.

Grading Interrobang 6 comprises two Minor Grades and one Major Grade Minor for parts 1-4 Minor for part 5-8 Major for parts 9-12 1. Illustrate fewer than 90% of listed principles = 79 and lower 2. Illustrate all listed principles = 90+. Illustrations must be clearly labeled or otherwise explained with the name of the physics principle, the appropriate equation(s) and the correct calculations.

Teams for Interrobang 6 1) Pick your own teams. Each team must be 2-4 members. 2) Showtimes for Physics periods 1, 2, 6 are assigned First come First served ) Showtime for AP Physics: March 28th (Tuesday) 2017 4) No extensions will be granted. Plan ahead, work ahead, finish early. Period 1 Period 2 Period 6 March 29 Wed March 0 thea, haven zane, jackson, luke Hannah, Jake, Ryan, Micah Maddie, Bri?any, Max, Greg z pa?on, z baker, antonio Katherine Ray Deen Cole Benne? Morgan March 1 Blake, Danyon Logan, Nari, Holly E Benne?, E Berent, Sam Powers, Dawson LibonaP cassidy, hailey, anna, kaitlin laurens lizzy Autumn Madison laurenr. casey Carson zach nick ben