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# prob05 - The Physics of Light Sound PROBLEM SET 5 GENERAL...

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The Physics of Light & Sound Instructions Complete the following exercises in class on Monday, May 23. Feel free to work together in groups or to consult with your instructor. These exercises are for your benefit and need not be turned in. Make sure you understand all of the material! 1. A pendulum swings back and forth. Explain physically why it returns approximately to the same point after each swing. 2. A pendulum is raised to 5 cm above the lowest point in its swing. What will be its speed when it reaches that lowest point? 5 cm v??? 3. Most grandfather clocks have a pendulum that ticks (makes half a swing) each second. What length of pendulum is required to produce this periodic motion? (g=9.8 m/s 2 ). 4. In reality, a pendulum will eventually damp and come to rest at its equilibrium position. Can you explain physically why this happens? 5. Medical applications of ultrasound use frequencies of up to 2 x 10 7 Hz. What is the wavelength of this frequency in air?

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