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3 . a) g i v e n, f r e q u e n c y = 500 H z w a v e l e n g t h = 0.66 m w e k n o w, v e l o c i t y = f r e q u e n c y \times w a v e l e n g t h v e l o c i t y = 500 \times 0.66 = 330 m / s b) i) w e k n o w, s p e e d o f w a v e i n l i q u i d m e d i u m i s m o r e t h a n s p e e d i n g a s e o u s m e d i u m . s o, A i s t r a v e l l i n g f a s t e r . i i) w e k n o w, m o l e c u l a r m a s s o f C O_{2} = 44 m o l e c u l a r m a s s o f H_{2} = 2 a n d s p e e d o f w a v e = \frac{1}{\sqrt{m o l e c u l a r m a s s}} s o, B i s t r a v e l l i n g f a s t e r .

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