# Question & Answer: 1 . a.) What is the wavelength of one ultraviolet (UV) photon if its frequency is 1.50 x 1015 s-1?…..

1 . a.) What is the wavelength of one ultraviolet (UV) photon if its frequency is 1.50 x 1015 s-1?

b.) What is the energy of one UV photon with the frequency given in (a)?

c.) What is the energy of one mole of UV photons of the same frequency given in (a)?

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2. An argon laser gives off pulse of green light (wavelength = 514 nm). If a single pulse from the laser has a total energy of 10 mJ, how many photons are in the pulse?

C   = v$\lambda$

$\lambda$    = C/v

= 3*10^8/1.5*10^15

= 2*10^-7 m

b. E = hv

= 6.625*10^-34 * 1.5*10^15

= 9.94*10^-19 J

c. one mole energy

9.94*10^-19 * 6.023*10^23   = 5.98*10^5 J/mole