A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is
Text Solution
Verified by ExpertsThe correct answer is:
B
For a string fixed at both ends, the resonant frequencies are
where 
The difference between two consecutive resonant frequencies is
which is also the lowest resonant frequency 
.
Thus, the lowest resonant frequency for the given string 
Hz 
Hz 
Hz
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