Standing waves are produced in a $10 \;m$ long stretched string. If the string vibrates in $5$ segments and the wave velocity is $20\; m/s$, the frequency is ... $Hz$
A$2$
B$4$
C$5$
D$10$
AIIMS 1998,AIPMT 1997, Medium
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C$5$
c (c) String vibrates in five segment so $\frac{5}{2}\lambda = l$
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