Which of the following energy transitions for electrons will occur when red light (650 nm) is absorbed by an atom?

Question

1) 3.4 x 10-36 J
2) 4.3 x 10-31 J
3) 4.6 x 105 J
4) 3.0 x 10-19 J

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Answer 1 · 2017-10-20T16:41:04

4)

#f = c/lamda#
#E=hf#

Remember unit conversion we're using nm so it's # * 10^-9#
so let's get f:

- # * # is the same as x I.E Multiplied by
- remember #c = 3 * 10^8 ms^-1#

#f = (3 * 10^8)/(650 * 10^-9)# which = #4.6 * 10^14#

# E = (6.63 * 10^-34)(4.6 * 10^14) #
which gives #3.04 * 10^-19#

Which is about 4)