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QUESTION

# What is the frequency of a light source that has a wavelength of 807 nm? What is the energy of this wave?

nu=3.71xx10^(14)s^(-1)

E=2.46xx10^(-19)J

The relationship between the wavelength lambda and the frequency nu is the following:

lambda=c/(nu)

where c is the speed of light c=2.9979xx10^8m/s.

Therefore, to calculate the frequency of a wave of 807 nm:

nu=c/(lambda)=(2.9979xx10^8cancel(m)/s)/(807xx10^(-9)cancel(m))=3.71xx10^(14)s^(-1)

nu could also be reported in units of Hertz: nu=3.71xx10^(14)Hz

The energy E of this wave can be calculated from:

E=hnu where h=6.626xx10^(-34)J*s is called .

E=hnu=6.626xx10^(-34)J*cancel(s)xx3.71xx10^(14)cancel(s^(-1))=2.46xx10^(-19)J