Answer:
He has trouble picking out the differences in the pitch of the sounds made by these instruments.
Step-by-step explanation:
The pitch of the sound refers to the frequency of a sound wave, which allows an individual to differentiate between a high pitch and a low pitch. A high pitched sound is derived from a fast vibrating object whereas a low pitched sound is derived from a slow vibrating object.
Eric is having trouble differentiating the pitch of sound of the flute and the trombone since he cannot distinguish which instrument is producing which types of sound waves.