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Which statement is correct for the wave Y = 3 sin[pi(t/3 - x/5) + pi/4]

The same question, asked 2 times: 21 Apr 2025 S2, 11 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    21 Apr 2025 S2

    34
    The equation of a progressive wave is Y=3sin⁡[π(t3−x5)+π4]Y= 3\sin\left\lbrack \pi\left( \frac{t}{3}-\frac{x}{5} \right)+\frac{\pi}{4} \right\rbrack where xx and yy are in meter and time in second. Which of the following is correct?

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  2. Question 2

    11 Apr 2026 S2

    123
    The equation of a progressive wave is Y=3sin⁡[π(t3−x5)+π4]Y = 3\sin\left[\pi\left(\dfrac{t}{3} - \dfrac{x}{5}\right) + \dfrac{\pi}{4}\right] where X and Y are in metre and time in second. Which of the following is correct?

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