uses of wavelength

[bhuvaneshnick]

red light has low frequency and high wavelenth

but the red light become less visibile after travelling .i mean cannot hit the wall which half kilometer from the source.

i need to know what changes in color with high frequency what changes in color with high wavelength

why it cannot hit the wall with same intensity as we seen at source

 

[ronsimpson]

Wavelength is the distance over which the wave's shape repeats. (meters or feet, distance)
Frequency is the number of complete cycles per second in alternating current direction. (cycles per second)
The two are 1/x related to each other.

I do not understand "hit the wall". I think you are asking about, why is light dimmer at a distance.
Light a candle. Put it inside a cup. One candle of light is spread out over the area of one cup.
Now move the candle to a large room. The same one candle of light is not spread out over one room. It is 1/1000 as bright.
Now move the candle to a foot ball field. The same amount of light is spread out over the field and is 1/100000000 as bright.
The farther away you are from the source the bigger area the light covers, and the less light makes it to your eye.

I hope this helps.

 

[bhuvaneshnick]

yes i understand,well.but where we consider wavelength as matter in apllication

 

[ronsimpson]

where we consider wavelength as matter in apllication

The same place we would consider frequency.

I don't understand the question. Do you want to know where RED is used and where GREEN is used?

The colors of the visible light spectrum
color, wavelength interval, frequency interval
red _____~ 700–635 nm, ~ 430–480 THz
orange__ _~ 635–590 nm, ~ 480–510 THz
yellow ___~ 590–560 nm, ~ 510–540 THz
green____ ~ 560–490 nm, ~ 540–610 THz
blue _____~ 490–450 nm, ~ 610–670 THz
violet or purple ~ 450–400 nm, ~ 670–750 THz

 

[bhuvaneshnick]

i have heard shorter wavelength penetrate much(x-rays).in way decreasing order.visible rays doesnt penetrate.but radio waves is very low wavelength is too low but penetrate ,how this is possible(radio waves penetrate walls and reach to phone)

 

[ramuna]

bhuvaneshnick said:
i have heard shorter wavelength penetrate much(x-rays).in way decreasing order.visible rays doesnt penetrate.but radio waves is very low wavelength is too low but penetrate ,how this is possible(radio waves penetrate walls and reach to phone)

Hi,

The explanation for the different penetration depths of the various wavelengths you have quoted is, unfortunately, divided into a number of parts. This is because the study of light is similarly subdivided into a number of specialisations (eg, radio engineering, radar engineering, infra-red eng., laser eng., nuclear physics, cosmic ray astronomy and so on). The most inclusive and encompassing study of this phenomenon concerns the transmittance and absorption of radiation (https://en.wikipedia.org/wiki/Transmittance and https://en.wikipedia.org/wiki/Absorption_(electromagnetic_radiation) ).

The above links should provide you with comprehensive explanations.

Another area, which is more closely connected with general electronics, especially electromagnetics and radio engineering, is the concept of skin-depth. See the following link for an explanation of this concept:

https://en.wikipedia.org/wiki/Skin_depth