Question

Is there any equation describing relationship of wavelength of any wave and its absorbance?

Answer 1

That I dont know...But loss (in db) can be calculated for propagating radio wave as-
L = (32.5+20 log d + 20 log f) db

all log are log base 10
d = distance between transmitter and receiver
f = frequency of radio wave

this loss is due to absorbtion, dispersion....etc etc....

Answer 2

use thiis for ^^ expla....
ELECTROMAGNETIC RADIATION


This page is a basic introduction to the electromagnetic spectrum sufficient for chemistry students interested in UV-visible absorption spectroscopy. If you are looking for any sort of explanations suitable for physics courses, then I'm afraid this isn't the right place for you.


Light as a wave form

Waves

Any wave is essentially just a way of shifting energy from one place to another - whether the fairly obvious transfer of energy in waves on the sea or in the much more difficult-to-imagine waves in light.

In waves on water, the energy is transferred by the movement of water molecules. But a particular water molecule doesn't travel all the way across the Atlantic - or even all the way across a pond. Depending on the depth of the water, water molecules follow a roughly circular path. As they move up to the top of the circle, the wave builds to a crest; as they move down again, you get a trough.

The energy is transferred by relatively small local movements in the environment. With water waves it is fairly easy to draw diagrams to show this happening with real molecules. With light it is more difficult.

The energy in light travels because of local fluctuating changes in electrical and magnetic fields - hence "electromagnetic" radiation.