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If speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$ and in water is $1480 \mathrm{~m} / \mathrm{s}$. If frequency of sound is 1000 kHz, then find wavelength in water
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$2.96 mm$
Given that, $\mathrm{v}_{\mathrm{w}}=1480 \mathrm{~m} / \mathrm{s}, \mathrm{f}=1000 \mathrm{kHz}$
Speed, $\mathrm{v}_{\mathrm{w}}=\mathrm{f} \lambda$
$\therefore \quad \lambda=\frac{\mathrm{v}_{\mathrm{w}}}{\mathrm{f}}=\frac{1480}{1000 \times 10^3}=1.480 \mathrm{~mm}$
Speed, $\mathrm{v}_{\mathrm{w}}=\mathrm{f} \lambda$
$\therefore \quad \lambda=\frac{\mathrm{v}_{\mathrm{w}}}{\mathrm{f}}=\frac{1480}{1000 \times 10^3}=1.480 \mathrm{~mm}$
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