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AP® Physics 1 & 2

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Refraction: Hydrogen Spectrum

APPH12-OK02EP

The red light from the hydrogen emission spectrum is the hydrogen -alpha line with a wavelength of 656.3 nanometers.

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

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