Auniform film of a material that has index of refraction 1.30 covers the front surface of a pane made of glass with index of refraction 1.55. when a beam of monochromatic light initially traveling in air strikes the film at normal incidence, the minimum film thickness for which the light reflected from the air-film interface and the light reflected from the film-glass interface cancel is 115 nm .
part a
what is the energy of each photon in the light beam?

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 .

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j