TUTORIAL QUESTIONS 115-125

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Questions:
115: Frequency and wavelength of standing waves.
120: Wavelength of a standing wave.
125: Modes.
 
 

115.  For a standing wave on a string,
a) you can have any  and any f so long as the relationship, v = f holds.
b) only certain wavelengths and frequencies are allowed
c) the wave velocity is totally determined by the medium
d) the wave velocity depends on the dynamic and inertial parameters
e) a and c only
f) b, c and d only 
g) a, c and d only
h) none of the above

Fundamentals of Sound reference: Sec. 2-C.
 
 
 
 
 

120.  Consider the diagram below for a standing wave on a string 9 ft long that is tied at both ends.  The wave velocity in the string is 16 ft/s.

What is the wavelength?

Click HERE to check your answer.
 
Fundamentals of Sound reference: Sec. 2-C.
 
 
 
 
 

125.  Consider again the diagram in Question 120 for a standing wave on a string 9 ft long that is tied at both ends. 

Which mode is this?

a) 2nd Harmonic (and no other answer is correct)
b) 3rd Harmonic ( and no other answer is correct)
c) 2nd Overtone( and no other answer is correct)
d) 3rd Overtone (and no other answer is correct)
e) Both a and c
f) Both b and d
g) Both b and c

Fundamentals of Sound reference: Sec. 2-C.
 
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