The frequency of a photon with an energy of 4.56×10⁻¹⁹ j would be 6.88×10¹⁴.
It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
C=λν
where c is the speed of light
λ is the wavelength
ν is the frequency of the photon of light
By using the planck's energy formula
E = hν
where h is the plancks constant with a value of 6.626×10⁻³⁴
4.56×10⁻¹⁹ = 6.626×10⁻³⁴ ₓ ν
ν =6.88×10¹⁴
Thus the frequency of the photon comes out to be 6.88×10¹⁴ Hz
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