11TH GRADE · OSCILLATIONS AND WAVES

Waves

Length, speed, frequency, phase and reflected signal.

22 minutes10 theory cards

LESSON MATERIAL

Basic Concepts

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.

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.

LESSON MATERIAL

v

Wave phase propagation speed.

Unit: meter per second · $\frac{\mathrm{m}}{\mathrm{s}}$

c

The limiting speed of propagation of electromagnetic interaction.

Unit: meter per second · $\frac{\mathrm{m}}{\mathrm{s}}$

\Delta\varphi

Phase shift of two oscillations.

Unit: radian · $\mathrm{rad}$

d

The difference in distances traveled by the compared waves.

Unit: meter · $\mathrm{m}$

LESSON MATERIAL

v=\lambda\nu

The speed of a wave is equal to the product of wavelength and frequency.

c=\lambda\nu

In a vacuum, the length and frequency of light are related by the speed of light.

\Delta\varphi=\frac{2\pi d}{\lambda}

The phase difference is proportional to the path difference and inversely proportional to the wavelength.

S=\frac{ct}{2}

The distance is equal to half the signal path there and back.

PRACTICE