Question

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question 7
7/10
what remains constant when light passes from one medium to another?
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energy
frequency
speed
wavelength

Explanation:

When light passes from one medium to another, the frequency remains constant. The energy of light is related to its frequency ($E = hf$, where $h$ is Planck's constant). Since no energy is lost or gained (assuming no absorption), the frequency must stay the same. The speed ($v$) of light changes because the refractive index ($n=\frac{c}{v}$, where $c$ is the speed of light in vacuum) of the medium changes. The wavelength ($\lambda=\frac{v}{f}$) also changes because $v$ changes and $f$ is constant.

Answer:

Frequency