Question
A string $1\,\,m$ long is drawn by a $300\,\,Hz$ vibrator attached to its end. The string vibrates in $3$ segments. The speed of transverse waves in the string is equal to .... $m/s$
✓
Answer
b
$\ell=1 \mathrm{m} \mathrm{f}=300 \mathrm{Hz}$
$\ell=1 \mathrm{m} \mathrm{f}=300 \mathrm{Hz}$
$\frac{3}{2} \lambda=\ell ; \mathrm{f}=\frac{\mathrm{v}}{\ell} ; \lambda=\frac{2 \ell}{3} ; \mathrm{v}=\mathrm{f} \lambda$
$v=300 \times \frac{2}{3} \times 1=200 \mathrm{m} / \mathrm{s}$
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