It's the angle made by the incident ray when it's perpendicular to the surface. (Perpendicular lines are the lines that form a graph or like a 90-degree angle)
The photon
energy is the energy carried by a single proton.
The equation used for calculating photon energy is:
E = hc / λ
where h = Planck constant
c = speed of light and
λ = wavelength of photon
frequency = f = c / λ
replace c /λ with f in the equation of photon energy
E = hf
frequency = 610 thz = 6.1 x 10¹⁴hz
h = 6.26 x 10⁻³⁴ js
E = 6.26 x 10⁻³⁴ x 6.1 x 10¹⁴
<span>E = 3.8 x
10</span>⁻¹⁹ j
Friction as it will move charge (electrons) from one object to another
Down because it doesn’t state a direction
