SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the Minnesota Department of Education. IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that school and district boundary data are up-to-date.
The spectral sensitivity is typically expressed as a QE Curve, in which the probability to detect a photon of a particular wavelength is expressed as a percentage.So for example if one in every 10 photons is detected this is expressed as a QE of 10%. The curve for a typical CCD is shown in the diagram on the below:
Noise sensitivity. The range of sound we can hear is phenomenal; some people can literally hear a pin drop and yet most can still tolerate loud sounds such as heavy machinery. Hyperacusis is an unusually low tolerance to ordinary environmental sounds, which are tolerable to listeners with normal hearing.