A tuning fork of frequency \( 480 \mathrm{~Hz} \) produces 10 beats per second when sounded with...

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A tuning fork of frequency \( 480 \mathrm{~Hz} \) produces 10 beats per second when sounded with a vibrating sonometer string. What must have been the frequency of the string if a slight increase in tension produces lesser beats per second than before :
(A) \( 460 \mathrm{~Hz} \)
(B) \( 470 \mathrm{~Hz} \)
(C) \( 480 \mathrm{~Hz} \)
(D) \( 490 \mathrm{~Hz} \)
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