11TH GRADE · OSCILLATIONS AND WAVES
Waves
Length, speed, frequency, phase and reflected signal.
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Basic Concepts
Wave
Propagation of vibrations in space with energy transfer without transfer of matter as a whole.
Particles of the medium oscillate around their positions, and the shape of the disturbance and energy propagate over a distance.
Phase difference
A value indicating the shift of two vibrations relative to each other.
At zero phase difference, the oscillations proceed synchronously, and at a difference π they reach opposite states.
Physical quantities
Wave speed
Wave phase propagation speed.
Unit: meter per second ·
Speed of light in vacuum
The limiting speed of propagation of electromagnetic interaction.
Unit: meter per second ·
Phase difference
Phase shift of two oscillations.
Unit: radian ·
Stroke difference
The difference in distances traveled by the compared waves.
Unit: meter ·
Lesson formulas
Mechanical wave speed
The speed of a wave is equal to the product of wavelength and frequency.
Electromagnetic wave speed
In a vacuum, the length and frequency of light are related by the speed of light.
Phase difference and stroke difference
The phase difference is proportional to the path difference and inversely proportional to the wavelength.
Signal delay distance
The distance is equal to half the signal path there and back.
Related formulas
The same formulas in the reference, with symbols and units.
Tasks on the topic
Statements, answer options and the walkthrough.