A wave of frequency 100 Hz s sent along a string towards a fixed unit. When this wave travels back after reflection a node is formed at a distance of 10 cm from the fixed end of the string.The speeds of incident (or reflected) waves are :

A wave of frequency 100 Hz s sent along a string towards a fixed unit.

1.	A wave of frequency 100 Hz s sent along a string towards a fixed unit. When this wave travels back after reflection a node is formed at a distance of 10 cm from the fixed end of the string.The speeds of incident (or reflected) waves are :
Answer» `10 m//s` `5 m//s` `40 m//s` `20 m//s` SOLUTION :Frequency v= 100 Hz `(lambda)/(2)=10 CM` `:.` WAVE length `lambda=20 cm 20xx10^(-2)m` `:.` Speed of the wave `v= v lambda` `=100xx20xx10^(-2)` `=20 m//s`