Calculate the energy and frequency of red light having a wavelength of 6.80x10-5cm?

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Answer 1 · 2018-03-17T02:34:14

#E = 2.92 xx 10^-19 \text(J) = 1.83 \text(eV)#

#f = 4.41 xx 10^14 \text(Hz)#

Given #\lambda = 6.80 xx 10^(-5) \text(cm) = 6.80 xx 10^(-7) \text(m)#

#E = (hc)/\lambda# and #f = c/\lambda#

#h = 6.626 × 10^(-34) \text(m)^2 \text(kg s)^(-1)#
#c = 3.00 xx 10^(8) \text(ms)^(-1)#

Hence:

#E = 2.92 xx 10^-19 \text(J) = 1.83 \text(eV)#

#f = 4.41 xx 10^14 \text(Hz)#