Q 10 Waves
A  string fixed at one end in vibrating in  its 
second overtone. The lengthh of the string is  
10 cm and maximum amplitude of vibration 
of particles of the string is 2mm. Then the 
amplitude of the particle at 9cm from the 
open end is: 
1)  $\sqrt{3} mm$                    2) $\sqrt{2} mm$
3) $\frac{\sqrt{3}}{2} mm$                   4) None of these