Question

when stationary waves are formed on a string of length 30cm long stretched between two rigid support s three loops are are observed what is it's wavelength​

Answer 1

Answer:

Wavelength of the standing wave formed in the string is 20 cm

Explanation:

If string is fixed at its two ends then the two ends of the string must be Nodes

Now it says that three loops are observed in the string so we will have

as we know that length of one loop is half of the wavelength

So we have

$3(\frac{\lambda}{2}) = L$

now we have

$\lambda = \frac{2L}{3}$

$\lambda = \frac{2\times 30}{3}$

$\lambda = 20 cm$

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Topic : Standing waves in string

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