Question

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

Answer 1

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

Learn more

The energy of a photon

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The equation E = hf

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

Answer 2

Answer:The energy of the photon is this light is $2.66\times 10^{-19} Joules$.

Explanation:

Wavelength of the electromagnetic radiation = 745 nm =$7.45\times 10^{-7} m$

$1m =1\times 10^{-9}nm$

Energy of the photon will be given by Plank's equation:

$E=\frac{hc}{\lambda }$

$E=\frac{6.626\times 10^{-34} J s\times 3\times 10^8 m/s}{7.45\times 10^{-7} m}$

$E=2.66\times 10^{-19} Joules$

The energy of the photon is this light is $2.66\times 10^{-19} Joules$.