1

Somsri bends a plastic ruler downward and releases its bent end (15 cm) as shown in the diagram. The ruler vibrates and makes a sound. She repeats the activity by releasing the bent end with length 5 cm of the ruler.

Which of the following is correct about the sound produced with the 15-cm bent end when compared to the 5-cm bent end?

Vibration Frequency Pitch
A Slower Lower Lower
B Slower Lower Higher
C Faster Higher Higher
D Faster Lower Lower

  • A

  • B

  • C

  • D