Planck's quantum theory and Photoelectric EffectWhat applications have been made from using the concepts of planck's quantum theory and ensteins...

A good example of one application in which both
photoelectric effect and quantum Planck theory are used together is the CCD (charge
coupled device) TV camera. Basically the CCD camera is composed of an array of
photoelectric sensors that under the action of external light produce an electric
current. This happens because of the internal photoelectric effect which is a slightly
modified version for semiconductors of the original external photoelectric effect for
metals. As said, each element from the array of sensors in a CCD camera act as a tiny
solar cell. To collect the electric charges that build up, the elements are connected in
series and scanned in rows one after each other (thus the name of charge coupled
devices), much like one reads the words from a book, by an electronic circuit that works
based on physical phenomena demonstrated by the Planck quantum theory. The charge
produced is moved from one device to the next one and so on, until it emerges in a
circuit outside the CCD camera itself.

 To
continue with examples of applications of photoelectric effect and Planck quantum
theory, the night vision devices used by the military are another good example. At the
lowest level, these night vision devices are small TV cameras having very sensitive
photoelectric devices (which can function at high light wavelengths - the infrared
spectrum). In the initial versions of these devices each incoming photon was producing
an electron, which by electric multiplication (in high electric fields) was producing in
turn many photons by striking a light emitting screen thus amplifying the light. In
modern versions an electronic circuit working on ideas derived from the Planck quantum
theory is amplifying the electric current produced by the infrared detectors.