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  • Writer's picturekeshprad

PhysicsBowl 2019 Q20


20) For this question, we want to find how the frequency of the string would change if we change the antinodes in the wave. We should start by looking at the initial situation with the given frequency.

Where L is length of string, f is frequency, and λ is the wavelength

Now the problem says that they are changing the situation to have 4 antinodes. This means that we will be changing the wavelength.

Where L is length of string, and λ is the wavelength

Using the wave equation we can find a relationship between wavelength and frequency.

Where v is velocity, and f is frequency, and λ is the wavelength

Answer: B

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