Question: Please help I have been stuck on these homework question for a long time!! a) Which of the following diagrams represents the standing wave pattern

Please help I have been stuck on these homework question for a long time!!
a)



Which of the following diagrams represents the standing wave pattern of the 1st harmonic in an air column closed at one end (ie. one fixed end, one free end), such as in a clarinet?INN A B C DA string of unknown frequency is sounded with a tuning fork of 414 Hz. There are 6 beats heard in 2.00s. The string is loosened and 4 beats are heard in 1.00s. Determine the original frequency of the string
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