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Standard XII

Physics

Resonance in Sound Waves

Two tuning fo...

Question

Two tuning forks have frequencies 200 Hz and x. When they are sounded together 4 beats / sec are heard. The value of x is

200 Hz or 198 Hz

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196 Hz or 204 Hz

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205 Hz or 201 Hz

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200 Hz only

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Solution

The correct option is B 196 Hz or 204 Hz
$G i v e n : b e a t = 4$

Frequencies $200 H z$ and $x$

Beat $= 200 - x$ or, Beat $= x - 200$
$4 = 200 - x$

$4 = x - 200$
$\Rightarrow x = 196 H z$ $\Rightarrow x = 204 H z$

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Two tuning forks have frequencies 200 Hz and x. When they are sounded together 4 beats / sec are heard. The value of x is

The correct option is B 196 Hz or 204 HzGiven:beat=4Frequencies 200Hz and xBeat =200−x or, Beat =x−2004=200−x 4=x−200⇒x=196Hz ⇒x=204Hz

The correct option is B 196 Hz or 204 Hz
$G i v e n : b e a t = 4$

Frequencies $200 H z$ and $x$

Beat $= 200 - x$ or, Beat $= x - 200$
$4 = 200 - x$

$4 = x - 200$
$\Rightarrow x = 196 H z$ $\Rightarrow x = 204 H z$