·
Stationary Wave: It is the resultant of two progressive
waves having same amplitude, same frequency and directed opposite along the
same line.
·
Nodes: The points on a stationary wave where the
resultant amplitude is zero.
·
Antinodes: The points on a stationary wave where the
resultant amplitude is maximum.
·
Fundamental Mode: Simplest mode of vibration.
·
Fundamental Frequency: Frequency of vibration in the
fundamental mode.
·
Harmonics: Integral multiples of the fundamental
frequency.
·
Overtones: Frequencies that accompany fundamental
frequency.
·
First Law of Vibrating String/Law of Length: If tension and mass
per unit length are kept constant, the fundamental frequency of the vibrating
string is inversely proportional to its vibrating length.
·
Second Law of Vibrating String/Law of Tension: If the length and
mass per unit length are kept constant, the fundamental frequency of the
vibrating string is directly proportional to the square root of tension.
·
Third Law of Vibrating String/Law of Mass Per Unit Length: If the tension and length are kept constant
the fundamental frequency of the string is inversely proportional to the
square root of mass per unit length of the wire.
·
Free Vibrations: When a body vibrates at its natural
frequency, the vibrations are called free vibrations.
·
Forced Vibrations: If a body is made to vibrate by an
external periodic force at a frequency different from the natural frequency,
the vibrations are known as forced vibrations.
·
Resonance: If a body is made to vibrate by an external
periodic force, with a frequency which is same as the natural frequency of
the body, the body vibrates with maximum amplitude. This is called resonance.
·
Sonometer: An instrument used
to determine the frequency of a tuning fork and also to verify the laws of
vibrating strings.
·
Transverse Position in Melde's
Experiment: The position in which the prongs of a tuning fork vibrate
perpendicular to the length of the string.
·
Longitudinal Position in Melde's
Experiment: The position in which the prongs of a tuning fork vibrate
parallel to the length of the string.
