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 .

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-the first industrial use of geothermal energy began near pisa, italy in late 18th century

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-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

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