Answer:The energy of the photon is this light is [tex]2.66\times 10^{-19} Joules[/tex].
Explanation:
Wavelength of the electromagnetic radiation = 745 nm =[tex]7.45\times 10^{-7} m[/tex]
[tex] 1m =1\times 10^{-9}nm[/tex]
Energy of the photon will be given by Plank's equation:
[tex]E=\frac{hc}{\lambda }[/tex]
[tex]E=\frac{6.626\times 10^{-34} J s\times 3\times 10^8 m/s}{7.45\times 10^{-7} m}[/tex]
[tex]E=2.66\times 10^{-19} Joules[/tex]
The energy of the photon is this light is [tex]2.66\times 10^{-19} Joules[/tex].
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
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Keywords: photon energy, Planck constant, wavelength, Frequency of electromagnetic waves
