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Use the fact that the frequency, multiplied by the wavelength, is equal to the speed of a wave. In a vacuum, light will move at 300 million meters/second; just divide this speed by the frequency.

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8y ago
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8y ago

300 divided by the frequency (in MHz) yields the wavelength so... 300/1.5 = 20 metres

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Q: What is the wavelength of a light-wave that has a frequency of 1500000 Hz?
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