In determining pitch, what is meant by frequency? a. How often the pitch is heard b. The number of vibrations per second c. The span between the highest and lowest notes d. How fast the pitches are played

## Step 1<br />The question is asking for the definition of frequency in the context of pitch. Frequency, in physics, is defined as the number of complete oscillations or cycles that a wave undergoes per unit of time. <br /><br />## Step 2<br />In the context of sound, frequency is perceived as pitch. The higher the frequency, the higher the pitch, and vice versa. <br /><br />## Step 3<br />Looking at the options provided, option B, "The number of vibrations per second", aligns with the definition of frequency. This is because the number of vibrations per second is essentially the number of cycles per second, which is the definition of frequency.