Question:
When a photon enters glass from air, which one of the following quantity does NOT change?
When a photon enters glass from air, which one of the following quantity does NOT change?
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When photons pass through a medium with different refractive indices, their velocity and wavelength change, but their energy and momentum remain unchanged.
Updated On: Jan 27, 2026
- Velocity
- Energy
- Momentum
- Wavelength
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The Correct Option is B
Solution and Explanation
Step 1: Properties of photons in different media.
When a photon enters a different medium, such as from air to glass, its velocity and wavelength change, but its energy and momentum remain constant. The energy of a photon depends on its frequency, and the frequency of the photon does not change when it enters the new medium.
Step 2: Conclusion.
Thus, the correct answer is (B) Energy.
When a photon enters a different medium, such as from air to glass, its velocity and wavelength change, but its energy and momentum remain constant. The energy of a photon depends on its frequency, and the frequency of the photon does not change when it enters the new medium.
Step 2: Conclusion.
Thus, the correct answer is (B) Energy.
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