Homework Help: Physics-Astronomy

Posted by Mark on Monday, November 16, 2009 at 10:51am.

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?

Physics-Astronomy - bobpursley, Monday, November 16, 2009 at 10:58am
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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