Physics

Problem

A laboratory siren increases its frequency uniformly from

10\,\text{Hz}

25\,\text{kHz}

15\,\text{s}

. For approximately how many seconds during this sweep will the sound be audible to a normal human ear? a)

15\,\text{s}

6\,\text{s}

12\,\text{s}

9\,\text{s}