Waves & Sound · JEE Main previous year questions

2006 1 question

1. Q922006 · 29 Apr 2006 · Shift 1

   A whistle producing sound waves of frequencies $9500\mathrm{Hz}$ and above is approaching a stationary person with speed $v\mathrm{m}{\mathrm{s}}^{-1}$. The velocity of sound in air is $300\mathrm{m}{\mathrm{s}}^{-1}$. If the person can hear frequencies upto a maximum of $10,000\mathrm{HZ}$, the maximum value of $v$ upto which he can hear whistle is

   1. A.$15\sqrt{2}\mathrm{m}{\mathrm{s}}^{-1}$
   2. B.$\frac{15}{\sqrt{2}}\mathrm{m}{\mathrm{s}}^{-1}$
   3. C.$15\mathrm{m}{\mathrm{s}}^{-1}$
   4. D.$30\mathrm{m}{\mathrm{s}}^{-1}$
   Show answer

   Answer: C