The wave that shows an old man yelling is ; ( B ) wave B
An old man has a low pitched voice due to old age therefore when he makes a sound, a diagram of his sound wave we depict a low frequency ( i.e. a low number of waves per cycle ) as seen in wave B.
When he yells the sound of his voice will increase ( i.e. increase in amplitude ) but the pitch of his voice remains the same and this can also be seen in wave B .
Hence we can conclude that the wave that shows an old man yelling at a dog is wave B.
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