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monochromatic light of wavelength 720 nm passes through a fast shutter, which stays open for a nanosecond. What will be the wavelength spread of the beam after the light emerges through the shutter?

monochromatic light of wavelength 720 nm passes through a fast shutter, which stays open for a nanosecond. What will be the wavelength spread of the beam after the light emerges through the shutter?

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