Physics

Problem

The wavelength of a certain photon is

4.0\,\mu\text{m}

. Using

c=3.00\times10^{8}\,\text{m\,s}^{-1}

and

h=6.63\times10^{-34}\,\text{J\,s}

, which of the following pairs correctly gives both the photon's energy and the region of the spectrum in which it falls? a)

1.3\times10^{-19}\,\text{J};\ \text{infrared}

5.0\times10^{-20}\,\text{J};\ \text{infrared}

5.0\times10^{-19}\,\text{J};\ \text{visible}

5.0\times10^{-20}\,\text{J};\ \text{microwave}