Which phenomenon weakens the forward-traveling portion of the wave?

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Multiple Choice

Which phenomenon weakens the forward-traveling portion of the wave?

Explanation:
When a wave hits a boundary, part of its energy is sent back as a reflected wave while part continues forward into the next medium. This redirection of energy away from the original forward path means less energy is traveling forward, so the forward-traveling portion is weakened. Reflection specifically reduces forward energy by sending it backward. (Absorption would steadily reduce forward energy as it travels through a medium, and refraction changes direction without necessarily reducing the forward energy as a whole.)

When a wave hits a boundary, part of its energy is sent back as a reflected wave while part continues forward into the next medium. This redirection of energy away from the original forward path means less energy is traveling forward, so the forward-traveling portion is weakened. Reflection specifically reduces forward energy by sending it backward. (Absorption would steadily reduce forward energy as it travels through a medium, and refraction changes direction without necessarily reducing the forward energy as a whole.)

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