Question

A wave is propagating along a string with a speed of $320cm/s$ as shown in the figure above.
Find out the frequency of the wave ?

• A. $1,280Hz$
• B. $640Hz$
• C. $320Hz$
• D. $80Hz$
• E. $40Hz$

Answer 1

Answer: (D)

$80Hz$

Given : $v=320$ cm/s

From figure, wavelength of the wave $\lambda =4$ cm

$\therefore$ Frequency of the wave $\nu =\frac{v}{\lambda }=\frac{320}{4}=80$ $Hz$