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The Electromagnetic Spectrum

The Electromagnetic Spectrum. The sun emits 4x10 26 W of electromagnetic radiation. What is the intensity of sunlight at the Earth’s distance (1.5x10 11 m)?. About 63% of the sun’s light actually makes it all the way to the ground on Earth.

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The Electromagnetic Spectrum

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  1. The Electromagnetic Spectrum

  2. The sun emits 4x1026 W of electromagnetic radiation. What is the intensity of sunlight at the Earth’s distance (1.5x1011 m)?

  3. About 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.

  4. The 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?

  5. An 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?

  6. Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t=6 s?

  7. Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t=6 s?

  8. You 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?

  9. If 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?

  10. A 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?

  11. LAB 8 OBJECTIVES: • 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.

  12. You’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 time.

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