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Question 21 (5 points) A 0.717-g guitar string is 0.629 m long. The string is under a tension of 73.9-N. What is the wavelength of the 6th harmonics in m? Your Answer: Answer Question 22 (5 points) A speaker emits sound waves with a power output of 150 watt. Considered it to be a small spherical source of sound. Determine the sound intensity 9.00 m from the speaker in W/m². Your Answer: Answer units Question 23 (3 points) A speaker emits sound waves with a power output of 150 watt. Considered it to be a small spherical source of sound. Determine sound intensity level, in dB, at 45.0 m from the speaker. Your Answer: Answer units