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Start the Sound (uses Java) simulation (opens in a new window). Select the Measure tab at the top left corner of your simulation window. Set the frequency to 200 Hz (once you click on the frequency button you can use the left and right arrow keys on your keyboard to decrease/increase the frequency to the desired value). Also set the amplitude to maximum. The waves are very now well defined. Pause the simulation. There are two blue lines that you can move by clicking and dragging them (your cursor should change to a double arrow when hovering over the lines). Your simulation window should look like in the picture below: Sound (2.19) File Help sten to a Single Source Two Source Interference Interference by Reflection isten with Varying Air Pressure MeasureI Frequency 200 Hz 0 123 4 5meters Amplitude Clear Wave Simulation Time 0.0000 sec Start Reset Help issouri.edu/courses/2753/Lab-7/sound.jar19. With the simulation paused, use the ruler and the two blue lines to determine the wavelength of the sound wave. Select the answer closest to yo measurement. A. 0.8 m B. 1.7 m C. 2.4 nm 20. Use the given frequency for this sound wave and the measured wavelength to calculate the speed of this sound wave. What is the approximate speed of this wave? A. 4 x 10-3 m/s B. 160 m/s C. 8 x 10-3 m/s D. 340 m/s 21. Now consider that you cannot read the frequency of the sound wave. You will need to find the speed of the sound wave using the measured wavelength and the period of the sound wave. To determine the period, you will need to use the stop watch. Set the two blue lines such that the distance between them is the equivalent of one wavelength. Remember, a time period represents the time it takes the wave to travel a distance equal to the wavelength. With the simulation stopped, push Start on the timer. As long as the wave is not moving, the timer measures no time Advance the wave step by step such that you can make sure it moved only one wavelength. The timer will give you the time for the wave to adv a wavelength: pay close attention to units. Select the answer closest to the period you measured A. 2.7 s B. 5.0 ms C. 5.0 s D. 2.7 m:s 22. Calculate the speed of the sound wave using the wavelength and period you measured. The speed of sound is approximately: A. 160 m/s B. 340 m/s C. 0.34 m/s D. 0.16 m/s

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