Which statement about stationary waves is correct (node spacing, harmonics in open and closed pipes, first overtone of a string)

1. A.
   The distance between consecutive nodes is equal to the wavelength.
2. B.
   In a pipe open at both ends only even harmonics are present.
3. C.
   In a pipe closed at one end, all harmonics are present.
4. D.
   In case of a stretched string when vibrated, frequency of first overtone is same as second harmonic.

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1. A.
   The distance between consecutive antinodes is equal to the wavelength.
2. B.
   In a pipe open at both ends when an air column is vibrated, only even harmonics are present.
3. C.
   When an air column is vibrated in a pipe closed at one end, all harmonics are present.
4. D.
   In the case of a stretched string, when vibrated frequency of the first overtone is same as the second harmonic.

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