The human eye is most sensitive to light with a frequency of about 5.5×1014 Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm?

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The human eye is most sensitive to light with a frequency of about 5.5 $c = 3.00 \times 10^{8} m / s)$ 10¹⁴ Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm?

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