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Which of the above two graphs (a) and (b) (Fig.) representing the human voice is likely to be the male voice? Give the reason for your answer.
 
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Generally the male voice has  as compared to female voice.
 
As the time period of wave represented by graph (a) is  that of graph (b). So, graph (a) represents  wave than graph (b).
 
Hence,  is likely to be the male voice.