Open and Closed Tube Sound Waves

Which of the following pairs of instruments have resonant frequencies at each whole number multiple

of the lowest frequency?

• a clamped string and a closed pipe

• a clamped string and an open pipe

• an open pipe and a closed pipe

• an open pipe and a reed instrument

Tags

NGSS.HS-PS4-1

The figure below shows a standing wave formed in

an open pipe of length L.The mode of vibration above represents the ______ harmonic for an open pipe.

• 2nd

• 3rd

• 4th

• 5th

Tags

NGSS.HS-PS4-1

If you blow across the open end of a soda bottle which acts like a closed pipe, and produce a tone of 250 Hz, what will be the resonant frequency of the next harmonic heard if you blow much harder?

• 125 Hz

• 250 Hz

• 500 Hz

• 750 Hz

Tags

NGSS.HS-PS4-1

The figure below shows a standing wave formed in

an open pipe of length L.The wavelength (𝜆) of the standing wave is ______.

• L

• 2L

• 2L/3

• 2/3L

Tags

NGSS.HS-PS4-1

The figure below shows a standing wave formed in

an open pipe of length L. The frequency (𝑓) of the standing wave is ____.

• v/2L

• 3v/2L

• 3L/2v

• 2L/v

Tags

NGSS.HS-PS4-1

The mode of vibration above represents the ______

harmonic for an open pipe.

• 1st

• 2nd

• 3rd

• 4th

Tags

NGSS.HS-PS4-1

The mode of vibration above represents the ______

harmonic for an closed pipe.

• 1st

• 3rd

• 5th

• 7th

Tags

NGSS.HS-PS4-1

The mode of vibration above represents the ______

harmonic for an closed pipe.

• 1st

• 3rd

• 5th

• 7th

Tags

NGSS.HS-PS4-1

The wavelength (𝜆) of the standing wave is ______.

• 4L/5

• 2L/5

• 2L/2

• 4L

Tags

NGSS.HS-PS4-1

The wavelength (𝜆) of the standing wave is ______.

• 4L/3

• 2L/3

• 2L/2

• 4L

Tags

NGSS.HS-PS4-1