NCEA Level 3 Physics Practice Questions - New Zealand NCEA Level 3 Physics Examination Exam

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Two point sources S₁ and S₂ in a ripple tank oscillate in phase with a frequency of 10.0 Hz, producing water waves traveling at 0.400 m s⁻¹. A point P is 0.520 m from S₁ and 0.660 m from S₂. What type of interference occurs at point P?

Fully constructive interference because the path difference is 3.5 wavelengths Fully destructive interference because the path difference is 3.5 wavelengths Fully constructive interference because the path difference is 3.0 wavelengths Fully destructive interference because the path difference is 4.0 wavelengths

Correct Answer:

Fully destructive interference because the path difference is 3.5 wavelengths

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