Physics, 21.04.2020 20:54 24mm05

PLantea y explica brevemente la ecuacion que rige el efecto fotoelectrico. Indica el significado de cada termino

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Answer from: bacon950

$hf=\phi + K_{max}$

Explanation:

The photoelectric effect occurs when there is electromagnetic radiation incident on the surface of a metal; if the frequency of the radiation is high enough, electrons are emitted from the surface of the metal.

The equation that describes this effect, described for the first time by Einstein, is:

$hf=\phi + K_{max}$

where:

is the energy of one photon of the incoming radiation, where

is the Planck constant

f is the frequency of the photon

$\phi$ is the work function of the metal, which is the minimum energy required to extract electrons from its surface

$K_{max}$ is the maximum kinetic energy of the emitted electrons

Looking at the formula we observe that:

- The minimum frequency at which electrons are emitted is found by requiring $K_{max}=0$ , so we have

$hf_t=\phi \rightarrow f_t = \frac{\phi}{h}$

where f_t is called threshold frequency. Therefore, electrons are emitted from the metal's surface only if $f\geq f_t$ .

- In the equation the intensity of the light does not appear. This means that if the frequency of the radiation is lower than the threshold frequency, no electrons will be emitted, no matter if we increase the intensity of the radiation.

Answer from: Quest

Texture and composition are different because they are not the same aspect. texture has to do with feel and so on, where as composition is the chemical makeup which you cant touch like you can texture.

Answer from: Quest

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

$x(t)=ax(x-6)$

where $a$ is unknown. because the position is parabolic, there is symmetry about the midpoint at $t=3$ , and we know that

$x(3)=10\implies -9a=10\implies a=-\dfrac{10}9$

so that the position function is

$x(t)=-\dfrac{10}9x(x-6)$

which means the velocity is

$v(t)=\dfrac{\mathrm dx}{\mathrm dt}=-\dfrac{20}9x+\dfrac{60}9$

then the total distance traveled is

$\displaystyle\int_{t=0}^{t=6}|v(t)|\,\mathrm dt=\left\{\int_{t-0}^{t=3}-\int_{t=3}^{t=6}\right\}v(t)\,\mathrm dt=20$

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at $x=0$ and ends at $x=0$ , so its displacement is 0.

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PLantea y explica brevemente la ecuacion que rige el efecto fotoelectrico. Indica el significado de...

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