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Two sources y1 = 4 sin(a pi t) and y2 = 3 sin(b pi t): beats per second and the ratio of waxing to waning intensity

The same question, asked 2 times: 21 Apr 2025 S1*, 18 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    21 Apr 2025 S1

    43
    Two sources of sound are emitting progressive waves y1=4sin⁡710πty_{1}= 4\sin710\pi t and y2=3sin⁡702πty_{2}= 3\sin702\pi t. The sources are placed close to each other. The number of beats heard per second and intensity ratio between waxing and waning are respectively

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  2. Question 2

    18 Apr 2026 S1

    121
    Two sources of sound are emitting progressive waves y1=4sin⁡708 πty_1 = 4\sin 708\,\pi t and y2=3sin⁡700 πty_2 = 3\sin 700\,\pi t. The sources are placed close to each other. The number of beats heard per second and intensity ratio between waxing and wanning are respectively

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