1. A) A sound wave has a power of 102 W and strikes a rectangular surface of length 12.3 cm and width 4.34 cm. What is the intensity of the wave? W B) A sound wave has an intensity of 453 3- It strikes a circular disk of diameter 10.4 cm and is absorbed by the disk. How much power is dissipated in the disk? C) A sound wave has an intensity of 289 LVZV and dissipates 123.6 W of power over a square tile, what is the length of one side of the tile? 2. A) A sound intensity of 1000 g has a sound level of how many decibels? B) A clap of thunder (120 db) from a nearby storm can cause permanent hearing loss. What is the intensity of such a sound? C) What change in decibel number will mean the power level has doubled? 3. A) An orchestra plays middle A (440 Hz). The speed of sound is 350.0 m/s on a warm summer's day. lfl am approaching the orchestra at 30.0 m/s, and the orchestra is moving at 20 m/s away on a flatbed in a parade, what frequency do I hear? B) A band in a parade is on a flatbed truck moving towards you. If the speed of sound that day was 350.0 m/s, and the band plays an A (440 Hz), what speed must it be travelling for you to hear a B (494 Hz) to a stationary watcher of the parade? C) An orchestra plays a note (494 Hz) when a 12.3 m/s wind is blowing. If you are seated listening, what frequency will you hear if the wind is blowing in your face directly from the orchestra? Assume the speed of sound is 343.2 m/s 4. A) A sound wave travelling at 352.5 m/s strikes a swimming pool at an angle of 122 to the vertical. At what angle does the sound wave travel in the pool if the speed of sound there is 15072 .S' B) A man strikes a bell underwater at 4678 Hz. The sound moves to the surface of the lake at 1438 m/s and strikes the surface at an angle of 5.07 to the vertical. At what angle does it leave the water if the speed of sound in air is 353.7 m/s