Theory of Oscillation and Waves

String tension:

• Depends on: Mass and position of the weight.

• Maximum tension: At the equilibrium position (EP).

• Minimum tension: At the amplitude.

Sound:

• Musical sound: Has a sound wave graph that is a periodic function with a defined frequency.

Three-phase asynchronous motor:

• Rotor: Rotates at a speed lower than the speed of the rotating magnetic field.

• Three-phase alternating current and single-phase alternating current: Creates a rotating magnetic field.

• Magnetic induction vector of the rotating magnetic field inside the stator: Only changes in direction, while the magnitude remains constant.

• Angular speed of the motor: Does not depend on the rotational speed of the magnetic field and the resistance torque.

Waves:

• Transmission from air to water:

• Electromagnetic waves: Wavelength decreases.

• Sound waves: Wavelength increases.

Spectrum:

• Continuous spectrum: Depends on the temperature of the light source, regardless of the composition of the light source.

Physical quantities:

• Sound intensity: Measured in W/m2.

• Frequency: Characterizes the rate of change of direction of the harmonic oscillation.

• Amplitude of forced oscillation: Does not change when the initial phase of the periodic forced excitation is changed.