The eyes of reptile pass a single visual signal to the brain when the visual receptors are struck by photons of wavelength of 850 nm. If a total energy of 3.15 x 10-14 J is required to trip the signal, what is the minimum number of photons that must strike the receptor?

The minimum number of photons that must strike the receptor is

Explanation:

The relation between energy and wavelength of light is given by Planck's equation, which is:

where,

E = energy of the light =

N= Number of photons = ?

h = Planck's constant =

c = speed of light =

= wavelength of light =

Thus the minimum number of photons that must strike the receptor is

i'm assuming that the correct answer is indeed the first one/ "a"..

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .