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The red light from the hydrogen emission spectrum is the hydrogen-alpha line with a wavelength of $656.3\text{ nm}$.

This wavelength is sent through water with an index of refraction of $1.33$.

Which of the following best represents the speed of light in water and the wavelength of the hydrogen emission line in the water?

A

${ v }_{ s }=2.19\times { 10 }^{ 8 }\text{ m/s}$
${ \lambda }_{ s }=493.5\text { nanometers}$

B

${ v }_{ s }=2.19\times { 10 }^{ 8 }\text{ m/s}$
${ \lambda }_{ s }=872.9\text { nanometers}$

C

${ v }_{ s }=2.26\times { 10 }^{ 8 }\text{ m/s}$
${ \lambda }_{ s }=493.5\text { nanometers}$

D

${ v }_{ s }=2.26\times { 10 }^{ 8 }\text{ m/s}$
${ \lambda }_{ s }=872.9\text { nanometers}$

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