1.

A string of length 75 cm is stretched between two fixed supports. It is found that standing waves may be excited at frequencies of 315 Hz and 420Hz, but at no frequencies in between. What is the lowest frequency at which a standing wave may be excited in this string ?

Answer»

SOLUTION :0105
`nlambda_(1)=(n+1)lambda_(2)`
`(n)/(315)=(n+1)/(420)impliesn=3`
fundamental n=1 so `V=(315)/(3)=105H_(2)`


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