Physics, 31.03.2020 17:01 cowerdwhisper23

What properties of a wave do you need to calculate the wave speed?

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Answer from: tsigler6425

The frequency and the wavelength

Explanation:

A wave is a periodic disturbance of the space that carries energy without carrying matter.

The displacement of a wave is described by a sine/cosine function.

Moreover, there exist two types of waves:

- Mechanical waves: they are produced by the oscillations of the particles in a medium - they can only propagate through a medium (not through a vacuum)

- Electromagnetic waves: they consist of the oscillations of the electric and magnetic fields - these are the only waves able to propagate through a vacuum

The speed of a wave is given by:

$v=f \lambda$

where:

is the frequency of the wave, which is the number of oscillations completed by the wave per second

$\lambda$ is the wavelength of the wave, which is the distance between two consecutive crests (point of maximum amplitude) of the wave

Therefore, if we know wavelength and frequency of a wave, we can calculate its speed.

Answer from: Quest

Isuck at math i am no sorry

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

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