MCQ 7_Open and closed pipe resonator

In the diagram which letters represent the nodes

• A B C

• A C E

• B D

• B D E

• A C D

When a guitar is tuned to adjust its pitch, what is it that is changed?

• The wavelength of the fundamental.
• The frequency of the fundamental.
• The amplitude of the fundamental.

In an Open-Ended Air Column, when the length of the tube increases, what happens to the Fundamental Frequency?

• The Fundamental Frequency increases.

• The Fundamental Frequency decreases.

• The Fundamental Frequency stays the same.

In an Closed-Ended Air Column, when the length of the tube increases, what happens to the Fundamental Frequency?

• The Fundamental Frequency increases.

• The Fundamental Frequency decreases.

• The Fundamental Frequency stays the same.

In an Open-Ended Air Column, when the length of the tube increases, what happens to the Wavelength?

• The Wavelength increases.

• The Wavelength decreases.

• The Wavelength stays the same.

In an Closed-Ended Air Column, when the length of the tube increases, what happens to the Wavelength?

• The Wavelength increases.

• The Wavelength decreases.

• The Wavelength stays the same.

In an Open-Ended Air Column, when the length of the tube increases, what happens to the Wave Speed?

• The Wave Speed increases.

• The Wave Speed decreases.

• The Wave Speed stays the same.

In an Closed-Ended Air Column, when the length of the tube increases, what happens to the Wave Speed?

• The Wave Speed increases.

• The Wave Speed decreases.

• The Wave Speed stays the same.

In an Open-Ended Air Column, to determine the wavelength you use -

• $\lambda=4\cdot L$

• $\lambda=\frac{L}{4}$
  

• $\lambda=2\cdot L$
  

• $\lambda=\frac{L}{2}$

In an Closed-Ended Air Column, to determine the wavelength you use -

• $\lambda=4\cdot L$

• $\lambda=\frac{L}{4}$
  

• $\lambda=2\cdot L$
  

• $\lambda=\frac{L}{2}$