The length of a sonometer wire is 90cm and the stationary wave setup in the wire is representedby an equation y=6sin((pix)/(30))cos(250t) where x , y are in cm and t is in second. The number of loops is

The length of a sonometer wire is 90cm and the stationary wave setup i

1.	The length of a sonometer wire is 90cm and the stationary wave setup in the wire is representedby an equation y=6sin((pix)/(30))cos(250t) where x , y are in cm and t is in second. The number of loops is
Answer» `1` `2` `4` `3` Solution :By comparing with `y=2Asin(KX)cos(250t)` `K=(pi)/(30)implieslambda=(2pi)/(k)`, `L=90cm`, `l=(plambda)/(2)`