Correct answer only !

which wave shows an old man who is yelling at dog to get out of his yard? consider both the frequency and amplitude of the sound wave.

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.

Learn more : link

-- An angry old man has a low grumbly voice (low frequency)

-- A man who is yelling is making sound with large amplitude

The wave with low frequency and high amplitude is B .

double the distance = divide strength by 4