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14.Waves and Sound
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Four tuning forks of frequencies $200,201, 204$ and $206\, Hz$ are sounded together. The beat frequency will be
A
$6$
B
$12$
C
$15$
D
None of these
Solution

$\left( {\frac{1}{1}} \right)$
$\left( {\left( {\frac{1}{2}} \right)} \right)\left( {\frac{2}{2}} \right)$ $\frac{1}{3}\left[ {\frac{2}{3}} \right]\left( {\frac{3}{3}} \right)$
$\frac{1}{4}\left( {\left( {\frac{2}{4}} \right)} \right)\frac{3}{4}\left( {\frac{4}{4}} \right)$ $\frac{1}{5}\frac{2}{5}\frac{3}{5}\frac{4}{5}\left( {\frac{5}{5}} \right)$
$\frac{1}{6}\frac{2}{6}\left( {\left( {\frac{3}{6}} \right)} \right)\left[ {\frac{4}{6}} \right]\frac{5}{6}\left( {\frac{6}{6}} \right)$
$Total =12$
Standard 11
Physics
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