A medium is a substance or material that carries the wave. Sounds waves need a medium in order to travel through a wave to help it travel as it cannot travel through a vacuum. Mechanical waves need a medium to transport energy.
One must have at least two visual pigments to distinguish between wavelengths independent of light intensity.
A substance that converts light energy into electrical potentials is called a visual pigment.
The basic structure of pigment consists of the chromophore, a colored molecule, and a protein called rhodopsin.
There are three types of visual pigments: Scotopsin, rhodopsins, and photopsin.
Scotopsin pigments are associated with vision and operate in less bright light while photopsin operates in a brighter light.
However, visual pigments are very significant substances as they are associated with vision and play a vital role in detecting light.
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The equator would be warmer than the poles. :)
Answer:
The energy of each photon in the light beam is 
.
Explanation:
Given that,
Index of refraction of glass =1.55
Index of refraction of material =1.30
Wavelength = 115 nm
We need to calculate the energy of each photon in the light beam
Using formula of energy
Where, h = Planck constant
=wavelength
c = speed of light
Put the value into formula
Hence, The energy of each photon in the light beam is .
Answer:
125 / 500 = 1/4 of the sample left after 3.0 yrs
1/2 * 1/2 = 1/4 sample has decayed thru 2 half-lives
2 * HL = 3
1 Half-Life = 1.5 yrs
