Q   21 .   T h e   s t a t i o n a r y   w a v e   p r o d u c e d   o n   a   s t r i n g   i s   r e p r e s e n t e d   b y   t h e   e q u a t i o n   y = 6   cos πX 4   sin   35 πt ,   where   x   and   y   are   in   cm   and   t   in   second .   The   distance   between   consecutive   nodes   is a   2   cm                                             b   3   cm c   4   cm                                             d   8   cm

Dear Student ,
Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/q-the-stationary-wave-produced-on-a-string-is-represente/wave-optics/12008653

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