The first ionization energy, E , of a helium atom is 3.94 aJ. What is the wavelength of light, in nanometers, that is just sufficient to ionize a helium atom? Values for constants can be found in the Chempendix.

50.2 nm

Explanation:

The relation between energy and wavelength of light is given by Planck's equation, which is:

where,

E = energy of the light = 3.94aJ=  

h = Planck's constant =

c = speed of light =

= wavelength of light = ?

Putting all the values we get:

Thus the wavelength of light, in nanometers that is just sufficient to ionize a helium atom is 50.2 nm

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