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Standard XII

Physics

Beat Frequency

Tuning fork C...

Question

Tuning fork C of frequency 305 Hz gives 5 beats/sec with tuning fork D when sounded together. When prongs of D are filled a little they produce 3 beats/s. The frequency of tuning fork D before filling is:

310 Hz

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300 Hz

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295 Hz

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315 Hz

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Solution

The correct option is A 310 Hz
No. of Beats $= | f_{1} - f_{2} | = 5$
Given, $f_{1} = 305 H z$
On filling fork D, no. of beats decreases, it means $f_{)} 2 > f_{1}$
$\Rightarrow f_{2} - f_{1} = 5$
$\Rightarrow f_{2} = 5 + f_{1} = 310 H z$

Therefore, A is correct option.

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Tuning fork C of frequency 305 Hz gives 5 beats/sec with tuning fork D when sounded together. When prongs of D are filled a little they produce 3 beats/s. The frequency of tuning fork D before filling is:

The correct option is A 310 HzNo. of Beats =|f1−f2|=5Given, f1=305HzOn filling fork D, no. of beats decreases, it means f)2>f1 ⇒f2−f1=5⇒f2=5+f1=310HzTherefore, A is correct option.

The correct option is A 310 Hz
No. of Beats $= | f_{1} - f_{2} | = 5$
Given, $f_{1} = 305 H z$
On filling fork D, no. of beats decreases, it means $f_{)} 2 > f_{1}$
$\Rightarrow f_{2} - f_{1} = 5$
$\Rightarrow f_{2} = 5 + f_{1} = 310 H z$

Therefore, A is correct option.