A beam of light is shined on a thin (sub-millimeter thick) single crystal wafer of material. The light source is special since it can be tuned to provide any wavelength of visible light on demand. The specimen is illuminated such that the wavelength of light is increased over time while the transmitted intensity of the light is measured. If the sample becomes transparent when the wavelength is greater than 690 nanometers, what is the band gap of the material, in eV

The energy gap of the material is

Explanation:

From the question we are told that

    The wavelength is

The band gap of the material can be mathematically represented as

Where h is the Planck constant with value  

           c is the speed of light with a value

    Substituting value

Now converting to eV we divide by the charge on on electron. the value is  

     so

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop