मराठी

Harmonics and Overtones

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Topics

Estimated time: 10 minutes
  • End Correction
  • Vibrations of air column in a pipe closed at one end
  • Vibrations of air column in a pipe open at both ends
  • Practical Determination of End Connection
  • Vibrations Produced in a String
  • Laws of a Vibrating String
  1. Law of length
  2. Law of tension
  3. Law of linear density
Maharashtra State Board: Class 11

Definition: Harmonics

All the frequencies that are integral multiples of the fundamental frequency are called harmonics.

Maharashtra State Board: Class 11

Definition: Overtones

Only those multiples of fundamental frequency which are actually present in a given sound are called overtones.

Maharashtra State Board: Class 11

Definition: Organ Pipe

The musical instruments which are used for producing musical sounds by blowing air into them are called organ pipes.

Maharashtra State Board: Class 11

Formula: Closed Organ Pipe

Mode Formula Also Known As
1st mode (Fundamental) n1 = \[\frac {v}{4L}\] 1st harmonic
2nd mode n2 = \[\frac {3v}{4L}\] = 3n1 3rd harmonic or 1st overtone
pth np = (2p − 1)\[\frac {v}{4L}\] (2p − 1)th harmonic or (2p − 3)th overtone
Maharashtra State Board: Class 11

Formula: Open Organ Pipe

Mode Formula Also Known As
1st mode (Fundamental) n1 = \[\frac {v}{2L}\] 1st harmonic
2nd mode n2 = \[\frac {v}{L}\] = 2n1 2nd harmonic or 1st overtone
pth mode np = p\[\frac {v}{2L}\] pth harmonic or (p − 1)th overtone
Maharashtra State Board: Class 11

Formula: Wavelength & Length Relations

Pipe Length of pipe Possible wavelengths
Closed L = (n + \[\frac {1}{2}\])\[\frac {λ}{2}\]​, for n = 0,1,2,… λ = \[\frac {2L}{(n+\frac {1}{2})}\]
Open L = \[\frac {nλ}{2}\], where n=1,2,3,… λ = \[\frac {2L}{n}\]
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