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14.Waves and Sound
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દોરી પરના તરંગ $y=0.002 \sin (300 t-15 x)$ અને રેખીય ઘનતા $\mu=\frac{0.1\, kg }{m}$ હોય તો દોરીમાં તણાવ શોધો. ($N$ માં)
A
$30$
B
$20$
C
$40$
D
$45$
(AIIMS-2019)
Solution
The given string wave equation is,
$y=0.002 \sin (300 t-15 x)$
From the above equation,
$\omega=300$
$k=15$
The wave speed is calculated as,
$v=\frac{\omega}{k}$
$=\frac{300}{15}$
$=20 m / s$
Also, the expression for the wave speed in the string is,
$v=\sqrt{\frac{T}{\mu}}$
$20=\sqrt{\frac{T}{0.1}}$
$T=0.1 \times 20^{2}$
$=40 N$
Standard 11
Physics