Which type of electromagnetic radiation has the least amount of energy per photon?

Name: Which type of electromagnetic radiation has the least amount of energy per photon?
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Question

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Radio waves have the lowest frequency and longest wavelength, which means they have the least energy per photon. This is because energy is directly proportional to frequency and inversely proportional to wavelength (E=hf=hc/λ), so a longer wavelength means lower frequency and lower energy.

Which Type of Electromagnetic Radiation Has the Least Amount of Energy