A stretched string fixed at both ends has m nodes, then the length of the string will be [MHTCET 2019]

MHT CET Physics question

A stretched string fixed at both ends has nodes, then the length of the string will be [MHTCET 2019]

Answer: (A)

Adjacent nodes are apart and nodes (including both fixed ends) enclose loops, so

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Question ID VK-070366