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grigory [225]
3 years ago
5

We say that visible light has wavelength from 400nm to roughly 800nm. What is the biggest "energy-jump" (excited) for an atom if

the photon which was sent out was visible? What's the biggest "energy-jump"?
(Give the answer in joules)

thanks !! ;-)
Physics
1 answer:
icang [17]3 years ago
6 0

Answer:

4.98\cdot 10^{-19} J

Explanation:

The energy of the emitted photon is inversely proportional to its wavelength, according to the equation:

E=\frac{hc}{\lambda}

where

h=6.63\cdot 10^{-34} Js is the Planck's constant

c=3.0\cdot 10^8 m/s is the speed of light

\lambda is the wavelength

This means that the biggest energy is released when the wavelength is the shortest. For a photon of visible light, the shortest wavelength is

\lambda=400 nm = 400\cdot 10^{-9} m

So, substituting into the equation, we find the corresponding energy:

E=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{400\cdot 10^{-9}}=4.98\cdot 10^{-19} J

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