What is your observation when two sources are emitting sound with frequency $499 \mathrm{~Hz}$ and $501…

What is your observation when two sources are emitting sound with frequency $499 \mathrm{~Hz}$ and $501 \mathrm{~Hz}$ ?
  1. Frequency of $500 \mathrm{~Hz}$ is heard with change in intensity take place twice.
  2. Frequency of $500 \mathrm{~Hz}$ is heard with change in intensity take place once.
  3. Frequenc y of $2 \mathrm{~Hz}$ is heard with change in intensity take place once.
  4. Frequency of $2 \mathrm{~Hz}$ is heard with change in intensity take place twice.

Solution

Here, $v_1=499 \mathrm{~Hz}, v_2=501 \mathrm{~Hz}$ $\begin{aligned} \text { Frequency heard } & =\frac{v_1+v_2}{2}=\frac{499+501}{2} \\ & =500 \mathrm{~Hz} \end{aligned}$ Since the difference in intensity is 2 , change in intensity take place twice.

Asked in: NEET 2009 (Screening)

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