energy of a photon

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Brandon Gruender 3F
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Joined: Wed Sep 30, 2020 10:03 pm

energy of a photon

Postby Brandon Gruender 3F » Sun Nov 01, 2020 6:12 pm

Question #25 asks

The E Coli bacterium is about 2.4 μm long. Suppose you want to study it using photons of that wavelength or electrons having that de Broglie wavelength.

What is the energy E photon of the photon?

How do I solve this?

Hayden Lee 1C
Posts: 86
Joined: Wed Sep 30, 2020 9:57 pm

Re: energy of a photon

Postby Hayden Lee 1C » Sun Nov 01, 2020 7:17 pm


Since the energy of a photon is equal to its frequency multiplied by Planck's constant, we can rewrite the equation (c = wavelength * frequency) to solve for frequency in terms of wavelength. We can then replace frequency in the E = hv equation with the term from the rewritten (c = wavelength * frequency) equation and solve for the energy. I hope this helps!

Edwin Liang 1I
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Joined: Wed Sep 30, 2020 9:34 pm

Re: energy of a photon

Postby Edwin Liang 1I » Sun Nov 01, 2020 7:27 pm


You would use the equations E = HV and c= λv. Convert the 2.4 μm to meters and insert that into c= λv for λ. Isolate for v, then use that to solve the E = HV equation

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Joined: Wed Sep 30, 2020 9:49 pm

Re: energy of a photon

Postby IshanModiDis2L » Sun Nov 01, 2020 9:35 pm

You would first start off by using the equation c= wavelength*frequency. you convert 2.4 μm to meters using unit analysis into meters and then solve for frequency. Once calculated, you would then plug your frequency value into E=HV, where h is represented by Plank's constant and V is the frequency and get your value for energy.

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