part b consider the original sound wave. which of the four examples represents the same sound but much louder?

Explanation:

Step1: Recall sound - wave property

Loudness of a sound wave is related to its amplitude. Larger amplitude means louder sound.

Step2: Analyze the waves

We need to find the wave with the same frequency (same number of cycles in a given time) as the original but with a larger amplitude. Among the options, the wave that has the same number of peaks and troughs in a given time interval as the original wave and has a greater height (amplitude) is the one representing a louder sound.

Answer:

C