If you set up the seventh harmonic on a string fixed at both ends, how many nodes and antinodes are set up…

If you set up the seventh harmonic on a string fixed at both ends, how many nodes and antinodes are set up in it?
  1. (a) $8, 7$
  2. (b) $7, 7$
  3. (c) $8, 9$
  4. (d) $9, 8$

Solution

7th harmonic means 7 loops. In one loop, there are 2 nodes and 1 antinode. In 7 loops, there will be 8 nodes and 7 antinodes.

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