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In which region of the electromagnetic spectrum do we find the energy to fully ionize hydrogen?

A) Radio
B) Infrared
C) Visible
D) Ultra-violet
E) X-ray

I want to know how you would go about doing this question; I know we need to find the wavelength, but what exactly is the connection between wavelength and energy required?

  • Physics -

    Energy= boltzmanns constant*speedlight/wavelength

    Energy= inonization energy
    wavelength= incoming light

    solve for wavelength.

    Remember: MEMORIZE
    Planck's equation
    energy= boltzmannconstant*frequency

  • Physics -

    E)X-Ray region

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