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17. Refer to the diagram Closed-Pipe Resonance to answer this question. When a 494-HE tuning fork (A) is held over the tube, the shortest length (L) for which resonance occurs is 17.0 cm. Without changing the length of the tube, tuning fork A is replaced by tuning fork B. While tuning fork B is vibrating over the end of the tube, the tube is lengthened until the next point of greatest resonance is produced. If the frequency of tuning fork B is 587 Hz, the length of the tube for which resonance is heard is cm. (Record your three-digit answer on the answer sheet.) bos Enter your answer as centimetres. 18. The speed of sound in air is measured at 335 m/s. The frequency of a sound emitted by a source moving toward you is found to be 458 Hz. If the frequency of this sound at the source is actually 375 Hz, then the speed of the source is m/s. (Record your three-digit answer on the answer sheet.) Do nonssol and ist