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A string is stretched between fixed poin...

A string is stretched between fixed points separated by 75.0 cm. It is obsereved to have resonant frequencies of 420 Hz and 315 Hz. They are no other resonant frequencies between these two. The lowest resonant frequencies for this string is

A

`105 Hz`

B

`155 Hz`

C

`205 Hz`

D

`10.5 Hz`

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