Question -
Answer -
Answer: First (Fundamental); No
Length of the pipe, l = 20cm = 0.2 m
Source frequency = nth normalmode of frequency, νn = 430 Hz
Speed of sound, v = 340 m/s
In a closed pipe, the nth normalmode of frequency is given by the relation:
Hence, the first mode of vibration frequency is resonantlyexcited by the given source.
In a pipe open at both ends, the nth modeof vibration frequency is given by the relation:
Since the number of the mode of vibration (n)has to be an integer, the given source does not produce a resonant vibration inan open pipe.