Which phenomenon cannot be explained by the wave theory of light

The same question, asked 2 times: 6 Apr 2024, 28 Jan 2025. Every wording below, oldest first.

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Question 1
6 Apr 2024
6 $Which of the following phenomena cannot be explained by the wave nature of light? (A) reflection (B) diffraction (C) photoelectric effect (D) interference (E) polarization Choose the most appropriate answer from the options given below:$
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Question 2
28 Jan 2025
83 $Which of the following phenomena can- not be explained by wave theory of light?$
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