If vibrations of a string are to be increased by a factor of two, then tension in the string must be made

If the fundamental frequency of string is $220 \,cps$, the frequency of fifth harmonic will be ......... $cps$

Two points on a travelling wave having frequency $500\, Hz$ and velocity $300\, m/s$  are $60^o$ out of phase, then the minimum distance between the two points is ..... $m$

Two wires are producing fundamental notes of the same frequency. Change in which of the following factors of one wire will not produce beats between them

A string is fixed at both ends vibrates in a resonant mode with a separation $2.0 \,\,cm$ between the consecutive nodes. For the next higher resonant frequency, this separation is reduced to $1.6\,\, cm$. The length of the string is .... $cm$

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 ... $Hz$