Physics

Problem

Two strings of the same length

0.90\,\text{m}

are made of the same material but have linear mass densities

0.010\,\text{kg\,m}^{-1}

and

0.040\,\text{kg\,m}^{-1}

, respectively. They are stretched with the same tension

T

and vibrate in their second harmonics. If the beat frequency produced is

30\,\text{Hz}

, find the value of

T

. a)

36\,\text{N}

30\,\text{N}

52\,\text{N}

23\,\text{N}