14.Waves and Sound
medium

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

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