Question

give the ratios of velocity of light of wavelength 4000Å and 8000Å

Answer 1

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A/c to De-Brogley Wavelength

$wavelength = \frac{h}{mv} \\ \\ 1. \: \: 4000 \: angstrom = \frac{h}{mv _{1} } \\ \\ 2. \: \: 8000 \: angstrom = \frac{h}{mv _{2} } \\ \\ now \: ratio \\ \\ \frac{4000 \: angstrom = \frac{h}{mv _{1} } }{8000 \: angstrom = \frac{h}{mv _{2} } } \\ \\ \frac{1}{2} = \frac{v _{2}}{v _{1}}$