Final answer:
The increase in intensity from 40 dB to 90 dB for an 800 Hz tone does not change the pitch because pitch is determined by frequency, not intensity or loudness. The answer is: B) No.
Step-by-step explanation:
The question asks whether an increase in intensity from 40 dB to 90 dB for an 800 Hz tone results in a change in pitch. The answer is: B) No. Pitch is a perceptual property of sounds that allows us to order them on a frequency-related scale and is determined strictly by the frequency of the sound wave. In this case, the frequency remains constant at 800 Hz, therefore the pitch does not change. What changes is the intensity or loudness of the sound, which is a measure of the sound's power per unit area and is expressed in decibels (dB).
As a comparison, turning up the volume on your stereo, which increases the intensity, also does not change the pitch of the music or sound. The reason is that volume is related to loudness, not pitch.