Phys 161 Lab 8

What does a node represent in a standing sound wave?

• Maximum pressure

• Maximum air displacement

• Zero air displacement

•  Maximum sound speed

In an open tube, the displacement at the ends is:

• Always zero

• Always maximum

• Alternates between zero and maximum
  

• Dependent on the frequency

What is the formula for the resonance condition in an open tube (corrected)?

• L=nλ/4
  

• L=nλ/2

• L+0.4d=nλ/2

• L+0.8d=nλ/2

Which frequencies appear in a closed tube resonance?

• All even integers
  

• Multiples of the fundamental frequency only

• Only odd harmonics

• Only prime numbers

  
  

What device is used to generate the signal sent to the speaker?

• Oscilloscope

• Function generator

• Microphone

• Piston

How is the fundamental frequency (f₀) verified in the experiment?

• It is equal to the speed of sound

• It gives a sequence of odd or consecutive integers when used as a divisor

• It is the highest frequency detected

• It is calculated from the tube’s diameter

What is the corrected resonance condition for a closed tube?

• L=nλ/2

• L=nλ/4

• L+0.4d=nλ/4

• L+0.8d=nλ/4

What happens to the sound as you approach a resonant frequency during the experiment?

• It becomes inaudible

• It stays constant

•  It becomes distorted

• It becomes louder

What does the slope of the L vs. n graph represent in the closed tube analysis?

• Tube length

• Resonant frequency

• Wavelength

• Speed of sound

How is the speed of sound calculated in this lab?

• v=fλ

•  v=λ/f
  

• v=λ+f

• v=λ−f