Answer:
L=0.654 m
Explanation:
<u>Concepts and Principles  </u>
1- The speed of sound in air is expressed as a function of the temperature of air as follows:  
  v=(331 m/s)√(1+T_C/273°C)                        (1)
where 331 m/s is the speed of sound in air at temperature 0°C and Tc is the temperature of air in Celsius.  
<u>Standing Wave Patterns in Pipes:  </u>
A pipe open at both ends can have standing wave patterns with resonant frequencies:  
f=v/λ=nv/2L                     n=1,2,3.........
where v is the speed of sound in air.  
<u>Given Data </u>
f_1 (fundamental frequency of the flute) = 262 Hz 
T (temperature of the air) = 20°C  
The flute is open at both ends.  
<u>Required Data </u>
We are asked to determine the length of the tube.  
<u>Solution</u><u>  </u>
The speed of sound in air at temperature T = 20°C is found from Equation (1): 
  v=(331 m/s)√(1+T_C/273°C)  
  =342.91 m/s
The fundamental frequency of the flute is found by substituting n = 1 into Equation (2):  
f=v/2L
Solve for L:  
L=v/2f_1
L=0.654 m