JEE Mains · Physics · STD 11 - 14. waves and sound

A sound wave of frequency \(245 \,Hz\) travels with the speed of \(300\, ms ^{-1}\) along the positive \(x\)-axis. Each point of the wave moves to and fro through a total distance of \(6 \,cm\). What will be the mathematical expression of this travelling wave ?

A \(Y(x, t)=0.03\left[\sin 5.1 x-\left(0.2 \times 10^{3}\right) t\right]\)
B \(Y(x, t)=0.06\left[\sin 5.1 x-\left(1.5 \times 10^{3}\right) t\right]\)
C \(Y(x, t)=0.06\left[\sin 0.8 x-\left(0.5 \times 10^{3}\right) t\right]\)
D \(Y(x, t)=0.03\left[\sin 5.1 x-\left(1.5 \times 10^{3}\right) t\right]\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(Y(x, t)=0.03\left[\sin 5.1 x-\left(1.5 \times 10^{3}\right) t\right]\)

Step-by-step Solution

Detailed explanation

\(\omega=2 \pi f\) \(=1.5 \times 10^{3}\) \(A=\frac{6}{2}=3 \,cm =0.03\, m\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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