9.77 By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with certain speeds. When HI dissociates, the H atoms move away rapidly, whereas the heavier I atoms move more slowly. (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? (b) If a photon of 254 nm is used, what is the excess energy (in J) over that needed for dissociation? (c) If this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)?
9.77 By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with certain speeds. When HI dissociates, the H atoms move away rapidly, whereas the heavier I atoms move more slowly. (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? (b) If a photon of 254 nm is used, what is the excess energy (in J) over that needed for dissociation? (c) If this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)?
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Transcribed Image Text:9.77 By using photons of specific wavelengths, chemists can
dissociate gaseous HI to produce H atoms with certain speeds.
When HI dissociates, the H atoms move away rapidly, whereas
the heavier I atoms move more slowly.
(a) What is the longest wavelength (in nm) that can dissociate a
molecule of HI?
(b) If a photon of 254 nm is used, what is the excess energy (in J)
over that needed for dissociation?
(c) If this excess energy is carried away by the H atom as kinetic
energy, what is its speed (in m/s)?
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