Question

The speed of transverse vibrations in a stretched string is 700 cm/s. If the string is 2 m long, the frequency with which it resonates in fundamental mode is –

• A. $\frac{7}{2}$Hz
• B. $\frac{7}{4}$Hz
• C. 14 Hz
• D. $\frac{2}{7}$Hz

Answer 1

Answer: (B)

$\frac{7}{4}$Hz

Answer 2

Q L = $\frac{\lambda}{2}$ \ l = 2L & n = $\frac{v}{\lambda}$= $\frac{7}{4}$Hz