Electromagnetic radiation with wavelength of 745 nm appears as red lighting to human eye. the energy of the photon is this light is

The energy of the photon is E = 2.67.10⁻¹⁹ J

Further explanation

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:

E = hf - hfo

fo = the threshold frequency of electromagnetic waves

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

E = h. f

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 745 nm

745 nm = 745.10⁻⁹ m

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

E = h. c / lamda

E =: 6,626.10⁻³⁴. 3.10⁸/745 .10⁻⁹ m

E = 2.67.10⁻¹⁹

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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Keywords: photon energy, Planck constant, wavelength, Frequency of electromagnetic waves

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