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All waves obey the wave equation, even if they are not mechanical waves. For example, Blu-ray Disc players use blue light because it has a shorter wavelength than red light and is capable of reading more data in a smaller area on the disc.

The frequency of blue light is in the range of $6.06-6.68 \times 10^{14} \text{ Hz}$. Assume the speed of light to be $3.0 \times 10^8 \text{ m/s}$.

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