Why is every point of the wave the same amplitude and period

Because the frequency of the wave is fixed, when the frequency is fixed, it naturally means that the amplitude is the same, the amplitude is the same, and the period is the same.

Relationship between wavelength, frequency, period:

1.Wavelength refers to the distance between two adjacent crests (or troughs), and the SI unit of wavelength is m2To understand the cycle, you must first know the frequency:

Frequency is a measure of the number of rebirths of an event per unit of time (in electromagnetism, the number of vibrations per unit of time), and is usually represented in physics by the symbol f, and its SI unit is hertz (Hz). If an event is regenerated n times in time t, the frequency of this event is f = n t hertz.

The period refers to the minimum interval between the occurrence of repeated events, so the frequency can be expressed as the reciprocal of the period, the frequency = the reciprocal of the period, i.e. f = 1 t

where t denotes the period.

The frequency and period are determined by the wave source.

As for the wavelength, it is not only related to the source of the wave, but also related to the medium. That is, the wavelength is determined by both the source and the medium.

There is a formula: speed of the wave = wavelength * frequency, where the speed of the wave is determined by the medium.

Each particle on the wave gets its energy from the previous particle, and so on to the wave source, so that each particle gets the same energy, and the energy determines the amplitude, so the amplitude is the same (of course, if there is energy dissipation, the amplitude will decrease). Since the molecular force (energy transfer) process of each particle affected by the previous particle is exactly the same, the acceleration change process is also the same, so the form of motion must be the same, so each particle is imitating the motion form of the previous particle on it, so the period is the same.

As shown in the figure: the amplitude is the difference between the peak and the trough, look at the difference between the highest peak (peak) and the lowest peak (trough) of the waveform, the following figure is 30; Looking at the period is mainly to find a starting point, look down along the starting point, and encounter the first point with the same value and the same derivative as the starting point, the distance between this point and the starting point is the period, and the frequency is the reciprocal of the period, and the frequency is 1 30:

Frequency, which is the number of times a periodic change is completed per unit of time, is a quantity that describes the frequency of periodic motion, and is commonly represented by the symbol f or , the unit is one second and a minute, and the symbol is s-1. In order to commemorate the contribution of the German physicist Hertz, people named the unit of frequency hertz, abbreviated as "hertz", and the symbol is hz. Every object has an amplitude-independent frequency that is determined by its own properties, called natural frequencies.

The concept of frequency is used not only in mechanics and acoustics, but also in electromagnetics, optics and radio technology.

Amplitude refers to the maximum possible value of the physical quantity of vibration, usually expressed as a. It is a physical quantity that indicates the range and intensity of vibration.

1.The amplitude period and frequency are determined by the vibration source; The wave velocity is determined by the medium; The wavelength is determined by both the source and the medium, that is, by the period and the wave velocity;

2.The same wave is the source of vibration, a continuous wave;

3.The same wave propagates in different media, and the wave speed and wavelength change. The period and frequency remain unchanged;

4.When a wave enters from one medium to another, the wave speed and wavelength change; The period and frequency remain unchanged; The direction of propagation may change;

5.Tuning fork vibration is a damped vibration, but the vibration frequency is basically the same, so it can be approximated as simple harmonic vibration.

The energy of a wave is proportional to the square of its amplitude.

The following is a simple, energy-oriented analysis that middle school students can understand.

From an energy point of view.

The wave is transmitted to a particle in the medium, and this particle will vibrate, so that it has kinetic energy, and at the same time, the medium undergoes elastic deformation, so this particle also has potential energy. Kinetic energy and potential energy come from the wave source, so the energy of the wave source travels outward from near to far with the transmission of the wave.

Take the example of an elastic longitudinal wave passing through a thin rod to analyze the energy of the wave. Let the density of the fine rod be , and the end coordinates of the integrated element on the fine rod are x,x+δxWhen the longitudinal wave passes through the voxon, the displacement of the particle at x is y, the displacement of the particle at x+δx is y+δy, and the length increase of the voxon is δy

Equation from particle vibration.

The velocity at which the vibrating particle can be found is:

This formula also applies to transverse waves. It can be seen that the energy of the wave is proportional to the square of the amplitude a.

The amplitude indicates the magnitude of the amplitude and is proportional to the energy

The energy of light per unit of time is power. According to the wave theory, the power of light is and .

The amplitude of electromagnetic waves is related to answer. According to quantum theory, the energy of a single photon is determined by frequency (e=hv), and the energy of the entire light field is also related to the number of photons. The greater the light intensity, the denser the photons.

The amplitude is the amplitude of the fluctuation of the electromagnetic wave, and the greater the amplitude, the greater the energy.

The energy of electromagnetic waves is not only related to the amplitude, but also to the frequency, the higher the frequency, the greater the energy.

The amplitude indicates the magnitude of the amplitude and is proportional to the energy

The frequency is only related to the frequency of the wave source and not to the medium. Bo Hu Yin.

The wavelength is related to the speed and frequency of the wave, and for the circular wave with a fixed wave speed (such as a light wave in a vacuum or a sound wave in atmospheric air), the frequency is inversely proportional to the wavelength, and the amplitude is independent of the first two quantities.

In the case of forced vibration, the closer the driving force frequency is to the natural frequency, the more intense the vibration and the greater the amplitude. Therefore, the amplitude should be related to the proximity of the driving force frequency to the natural frequency. Personally, I think it is also related to the size of the driving force.

Hold the spring oscillator and keep vibrating your hand, if you use more force, the greater the amplitude.

Select CA Analysis: Wave Equation.

Derived from the vibration equation, it is implicit that when the wave source does not move, the vibrational period of the wave source is numerically the same as the period of the wave. b. Analysis of the world hall: the vibration velocity of the wave source describes the speed and slowness of the vibration of the particle near the equilibrium position; Wave velocity is a description of the speed at which a wave propagates.

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<> light waves with the same energy density, the higher the frequency slip, the lower the corresponding photon number density (because the energy of the individual photons is high)—the fewer the number of photons per unit volume. The square of the amplitude is proportional to the intensity of the light. The energy density of a light wave, and not its energy.

When you dig out the volume for Li Rang, if the energy density is the same everywhere in this volume, then the light wave is <>

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