Answer:
Approximately 3 photons
Explanation:
The energy of a photon at the peak of visual sensitivity is given by:
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
Substituting into the formula,
This is the energy of one photon. The human eye can detect an amount of energy of
So the amount of photons contained in this energy is
so approximately 3 photons.
1-make the surfaces smoother. Rough surfaces provide more friction; smoother surfaces reduce friction.
2-lubrication. Lubricant is a slippery substance that reduces friction by making a surface smoother.
3-reduce contact between surfaces.
4-reduce forces acting on surfaces. Stronger forces means higher friction; reducing the forces reduces the friction.
5-make a more streamlined object. Streamline shape allows water or air to flow around it easily, offering the least resistance.
The thermal motion of their particles spreads into your body. But there are different ways for that heat to transfer: It can transfer by conduction, convection, or radiation. Conduction is the transferring of heat by direct contact. Convection is transferring heat through the motions of fluids (gases and liquids).
Here are the ones that I know about
and can think of just now:
-- wind
-- solar
-- nuclear
-- tidal
-- hydro
-- geothermal
-- biomass