Physics-Astronomy

Hello, I have no idea how to do the following question. Any help would be appreciated:

An energy of at least 13.6 electron-volts is required to ionise a hydrogen atom. What is the longest wavelength of electromagnetic wave capable of ionising hydrogen? And which regions of the E-M spectrum correspond to photons capable of ionising hydrogen?

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asked by Mark
  1. 1) E=planck'sconstant*speedlight/wavelength
    solve for wavelength.

    2) http://www.astro.virginia.edu/class/oconnell/astr121/im/em-op-spectrum.gif

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