Length of a string in terms of wavelength from the number of nodes

1. A.
   $\frac{x\lambda}{2}$
2. B.
   $\frac{x+1}{2}\cdot\frac{\lambda}{2}$
3. C.
   $\frac{(x+1)\lambda}{2}$
4. D.
   $\frac{(x-1)\lambda}{2}$

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1. A.
   60 cm
2. B.
   75 cm
3. C.
   90 cm
4. D.
   30 cm

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1. A.
   $(n + 1)\dfrac{\lambda}{2}$
2. B.
   $n\lambda$
3. C.
   $\dfrac{n\lambda}{2}$
4. D.
   $(n - 1)\dfrac{\lambda}{2}$

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