Explain this given problem :

Dear Student,

g i v e n, \frac{λ}{2} = 4 c m [a s t h e d i s \tan c e b e t w e e n t w o a d j a c e n t n o d e s i s 4 c m] w a v e l e n g t h, λ = 8 c m = \frac{8}{100} m s p e e d o f s o u n d, v = 336 m / s w e k n o w, v = f λ f = \frac{v}{λ} f = \frac{336}{\frac{8}{100}} = \frac{336 \times 100}{8} f = 4200 H z = 4.2 K H z

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