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Question

Two tuning forks of frequency $$\displaystyle { n }_{ 1 }$$ and $$\displaystyle { n }_{ 2 }$$ produces n beats per second. If $$\displaystyle { n }_{ 2 }$$ and $$\displaystyle n$$ are known, $$\displaystyle { n }_{ 1 }$$ may be given by :


A
n2n+n2
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B
n2n
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C
n2±n
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D
n2nn2
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Solution

The correct option is D $$\displaystyle { n }_{ 2 }\pm n$$
Beat frequency = number of beats / sec.
$$\displaystyle n={ n }_{ 2 }\pm { n }_{ 1 }$$
$$\displaystyle \therefore \quad { n }_{ 1 }={ n }_{ 2 }\pm n$$

Physics

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