When the frequency of the vibration is doubled so the wavelength in the spring should be halved.
We know that the frequency and the wavelength should be inversely proportional to the each other. That means in the case when the frequency is high so the wavelength should be less. Also, when the frequency is twice so the wavelength should be one-half.
Therefore, we can conclude that When the frequency of the vibration is doubled so the wavelength in the spring should be halved.
Therefore, the option 2 is correct.
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