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  • A string of 7.8 m length has a mass of 0.048 Kg. I f the tension in the string is 98 N, then the speed of  a wave on the stringOption: 1 126 m/s

A string of 7.8 m length has a mass of 0.048 Kg. I f the tension in the string is 98 N, then the speed of  a wave on the string

Option: 1

126 m/s


Option: 2

120  m/s


Option: 3

136  m/s


Option: 4

130  m/s


Answers (1)

best_answer

\begin{aligned} & V=\sqrt{\frac{T}{\mu }}\left[\because \mu =\frac{m}{l}\right] \\ & V=\sqrt{\frac{98}{\frac{0.048}{7.8}}}=\sqrt{\frac{98 \times 7.8}{0.048}} \end{aligned}

\begin{aligned} & V=\sqrt{\frac{98978 \times 1008}{48 \times 16}}=10 \times 7 \sqrt{\frac{78}{24}} \\ & V=70 \sqrt{\frac{39}{12}}=70 \times \sqrt{3.25} \\ & V=70 \times 1.80 \\ & V=126 \mathrm{~m} / \mathrm{s} \end{aligned}

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