Quantum Physics: Radiation, Photoelectric Effect, and Uncertainty

THERMAL RADIATION. Planck's theory is called thermal radiation from a body emits _{electromagnetic} E due to t ª. To study this phenomenon, it is considered a physical system called black body, which is an ideal system able to absorb all the energy it receives in the form of electromagnetic wave and, therefore, also be an ideal emitter. The radiation emitted is a continuous spectrum of emission. Because there is continuous emission of electromagnetic waves at all frequencies. Another feature of the energy emitted is the existence of a frequency for which the emission intensity is maximum and whose position in the spectrum depends on temperature. By increasing black-body t ª, we obtain a similar distribution, in which the máximoE moves to shorter wavelengths.
Planck assumed that the atoms behave as tiny oscillators, each vibrating at different frequencies. Hypothesis: Each oscillator could absorb or emit energy in the form of electromagnetic radiation in amounts that are proportional to vibration frequency, E = h F, where h is Planck's constant. The bodies emit or absorb energy in a discontinuous way through packages or quanta of energy.

The Photoelectric Effect The photoelectric effect is the emission of electrons from the surface of a metal when light falls on it high enough frequency. To analyze the photoelectric effect from a device with a photocell connected to a power source.
"When you affect electromagnetic radiation whose frequency is equal to or greater than the threshold frequency fo, current flow occurs, a jump of electrons from cathode to anode.
Fo-Above is a jump-mail although the intensity is low. An increase in intensity of light radiation causes an increase in number of e ^- cast, but not their energy.
"If you reverse the polarity of the electrodes, the current intensity decreases. There is a potential value of V _or from which any e ^- reaches the anode. It is the stopping potential and determines the maximum kinetic energy of e ^-.
The energy emitted by a body in the form of electromagnetic waves is not distributed continuously across the wave front, but that is quantized into small packets or quanta of energy called photons.

Heisenberg uncertainty principle is impossible to know simultaneously the position and momentum (quantity of MVTO.) Of a particle. The more precise determination of one of them, the more inaccurate is another. The error made in determining their position (? X) by the error made in determining the amount of MVTO. (? P) is greater than or equal to 2D.