PowerPoint PresentationSlide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Week 9 1Week 9 2The Electromagnetic SpectrumWeek 9 3The sun emits 4x1026 W of electromagnetic radiation. What is the intensity of sunlight at the Earth’s distance (1.5x1011 m)?QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 4About 63% of the sun’s light actually makes it all the way to the ground on Earth. Two kids are outside on a sunny summer day. How much energy hits one of them every second? Assume each kid has an area of about 0.4m2.QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 5Week 9 6The sound intensity from a jack hammer breaking concrete is 2.0 W/m2 at a distance of 2 m from the point of impact. This is sufficient to cause permanent hearing damage if the operator doesn’t wear ear protection.What are the sound intensity and sound intensity level for a person watching from 50 m away?QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 7Week 9 8Week 9 9An osprey’s call is a distinct whistle at 2200 Hz. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 Hz. How fast is the osprey approaching?QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 10Week 9 11Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t=6 s?Week 9 12Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t=6 s?Week 9 13Week 9 14Week 9 15Week 9 16Week 9 17Week 9 18Week 9 19You find a 25 cm long metal pipe and decide to make a musical instrument out of it. What is the lowest frequency note you can make by blowing across the top of this pipe?QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 20If you put a cap on the other end and blow across the top, will the note become higher or lower pitch?What will be the lowest frequency sound you can play with the end capped?QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Week 9 21Week 9 22A drainage pipe running under the freeway is 30.0 m long. Both ends are open, and wind blowing across one end causes the air inside to vibrate.a. If the speed of sound on a particular day is 340 m/s, what will be the fundamental frequency of air vibration in this pipe?b. What is the frequency of the lowest harmonic that would be audible to the human ear?c. What will happen to the frequency in the late afternoon as the air begins to cool?Week 9 23Week 9 24• To investigate properties of sound waves and become familiar with how sounds of different pitch and loudness look graphically.• To explore the relationships between wavelength, frequency and amplitude.• To measure the speed of sound.LAB 8 OBJECTIVES:Week 9 25You’re singing karaoke. You sing a perfect ‘A’ note at 440 Hz while your drunk buddy sings the harmony completely off key at 300 Hz. Fortunately, your buddy is singing softly. Graph what each person’s sound looks like in terms of pressure measured at the microphone vs