Closed-Pipe Resonance A tuning fork held over a closed pipe produces resonance for particular lengths (1). (This diagram is not to scale.) Tuning fork B Tuning fork A L Sliding closed-pipe tube Water\f14. Refer to the diagram Closed-Pipe Resonance to answer this question. Tuning fork A is held over the end of the variable-length closed pipe. The length (L) of the pipe is gradually increased. As the pipe gets longer, the sound of the tuning fork first gets louder, then softer, then louder again. In terms of the wavelength of the sound produced by the tuning fork, which series of numbers represents possible values for the length of the pipe at which you would hear the loudest sound? a. = = 1 and C. ZEng A and A and d. L-3 A and 1416. A sound wave has a speed of 335 m's in air. If the frequency of the sound is 256 Hz, what is the wavelength of the sound? (Record your three-digit answer on the answer sheet.)1) Doppler effect: A siren emits sound waves at a frequency of 2600 Hz while driving on the highway with a velocity of 30 m/s. On this day the speed of sound is 325 m/s and you are relaxing by the road to admire the view of the mountains to the west. What frequency will you hear if ambulance is driving towards you? (2 marks) b) What is the frequency you hear once the ambulance passes you? (2 marks)