Final answer:
The correct statement about the two notes is that the louder note has a lower frequency. Pitch is associated with frequency while loudness corresponds to amplitude. The two properties, although different, outline the characteristics of sound waves.
Step-by-step explanation:
Understanding the concepts of pitch and loudness is essential when discussing sound waves. The frequency of a sound wave corresponds to what we perceive as pitch. A higher frequency equates to a higher pitch, whereas a lower frequency correlates with a lower pitch. Loudness, on the other hand, is related to the amplitude or intensity of the sound. In comparing two notes, a louder and lower pitch note indicates a lower frequency but higher amplitude.
Since the question states that the singer sings a louder and lower note followed by a note that is higher in pitch, we can deduce that the louder note has a lower frequency and higher amplitude. This distinguishes the properties of the two notes: the first one being louder and lower in pitch (lower frequency and higher amplitude) and the second one being higher in pitch (higher frequency and presumably lower amplitude).
Therefore, the correct statement regarding the two notes is that the louder note has a lower frequency. Loudness and pitch are related to different aspects of sound waves: amplitude and frequency, respectively, so they are not completely unrelated but rather they represent different characteristics of sound.