A piano creates sound waves of different pitches by striking a small hammer against the strings inside the instrument. When a key is struck, the corresponding hammer
strikes a string, causing a vibration that creates a sound wave. How do the sound
waves of the higher pitch notes compare to the sound waves of the lower pitch notes?

O The sound waves of notes with higher pitches travel at higher speed.
O The sound waves of notes with higher pitches have higher wavelengths.
O The sound waves of notes with higher pitches have higher frequencies.
O The sound waves of notes with higher pitches have higher amplitudes.