Calculate the energy for one mole of photons (an einstein) for light absorbed at 6.90 × 102 nm.

The energy for one mole of photons : 1.7343.10⁵ J

The photoelectric effect is an electron coming out of a metal because of electromagnetic radiation

One type of electromagnetic radiation is light

Electrons can come out of metal because they absorb electromagnetic energy radiated on metals. There is also kinetic energy released from metal, which is according to the equation:

fo = the threshold frequency of electromagnetic waves

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

f = c / λ

c = speed of light

= 3.10⁸

λ = wavelength

Known wavelength 6.90 × 10² nm

6.90 × 10² nm. = 6.9.10⁻⁷ m

We put it in the formula to find this light energy E = h. f

Because this is 1 photon energy, while the number of photons in one mole = 6.02.10²³, then the energy for one mole of photons

2.88 .10⁻¹⁹ x 6.02.10²³ = 1.7343.10⁵ J

Electromagnetic radiation with wavelength of 745 nm

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The energy of a photon

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The equation E = hf

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the approximate energy of a photon

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The equation for photon energy

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the wavelength of a photon whose energy is twice

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e

explanation:

a polar bond is formed when electrons are shared unevenly between atoms