When light travels from water to air, which property remains unchanged?

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Accepted Answer

1. Light frequency comes from the source and does not change at a boundary.
2. Speed changes between media: $v=\frac{c}{n}$, so $v$ is different in water and air.
3. Wavelength changes because $v=f\lambda$, and if $v$ changes while $f$ is fixed, $\lambda$ must change.
4. Hence the property that remains unchanged is **frequency**.

FINAL_ANSWER: b

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