Question

20 vibrations are produced in a slinky in 10 sec when a jerk is given to it .Find its time period and frequency .How can a longitudinal wave produced in a slinky ?

Answer 1

Dear Student,

20 vibrations in 10 sec
$$\begin{gathered} \mathrm{No}.\mathrm{of}\mathrm{vibration}\mathrm{in}1\sec =\frac{20}{10}=2 \\ 1\mathrm{vibration}\mathrm{in}=0.5\sec \mathrm{which}\mathrm{is}\mathrm{the}\mathrm{time}\mathrm{period} \\ \mathrm{frequency}=\mathrm{no}.\mathrm{of}\mathrm{vibration}\mathrm{produced}\mathrm{in}1\sec \\ \mathrm{frequency}=2\mathrm{Hz} \end{gathered}$$

You can produce a longitudinal wave in a slinky by displacing the first coil of the slinky in a direction parallel to the entire slinky.