A laboratory siren increases its frequency uniformly from to in

PHYSICS · Single correct · GCSE · Physics · Waves · Waves

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}

(b)

6\,\text{s}

(c)

12\,\text{s}

(d)

9\,\text{s}