Why is there a maximum kinetic energy in the photoelectric effect?
The two factors affecting maximum kinetic energy of photoelectrons are the frequency of the incident radiation and the material on the surface. As shown in the graph below, electron energy increases with frequency in a simple linear manner above the threshold.
Why does the photoelectric effect occur at low energy?
It explained why the energy of photoelectrons was dependent only on the frequency of the incident light and not on its intensity: at low-intensity, the high-frequency source could supply a few high energy photons, whereas at high-intensity, the low-frequency source would supply no photons of sufficient individual …
Why photoelectrons are emitted with different energies?
Originally Answered: In the photoelectric effect, why do emitted photoelectrons have a range of kinetic energies? Because incoming photons have a range of energy. There is a certain amount of energy needed to free the electron. If photons do not have this energy, nothing is emitted.
What is photoelectric effect which metal show this effect more easily and why?
Now, photoelectric effect occurs easily if the metal has low ionization potential. So, among the given options, cesium has the lowest ionization potential and hence it is best suitable for photoelectric effect.
Why is maximum photoelectric energy independent of intensity?
Electrons are ejected only when the frequency of the incident light is higher than a threshold value, fo, regardless of how intense the light is. The threshold frequency depends on the material being illuminated. However, the maximum kinetic energy (KEMAX) of the photoelectrons is independent of the light intensity.
What do you understand by photoelectric effect?
photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.
How does intensity affect the photoelectric effect?
In the photoelectric effect, light incident on the surface of a metal causes electrons to be ejected. The intensity affects the number of electrons, and the frequency affects the kinetic energy of the emitted electrons.
What is photoelectric effect establish Einstein’s photoelectric equation?
Each quantum has an energy h, if this energy exceeds the minimum energy to emit electron then the electron is emitted with maximum kinetic energy. Planck’s constant is h = 6.62 × 10−34 joule-sec. This equation is known as Einstein’s photoelectric equation.
Why does photoelectric effect support particle theory?
The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision (one that conserves mechanical energy) between two particles, the photon of light and the electron of the metal.
How does intensity affect photoelectric effect?
What is the photoelectric effect and why is it important?
The photoelectric effect occurs when all of the energy of the incident photon is transferred to an atomic electron and the electron is ejected from the atom. The photoelectric effect is important for photons below about 200–300 keV interacting with all but the lightest elements.
What is νν and W in photoelectric effect?
ν is the frequency of the incident photon. W is the work function, which is the minimum energy required to remove an electron from the surface of a given metal: hν 0. E is the maximum kinetic energy of ejected electrons: 1/2 mv 2. ν 0 is the threshold frequency for the photoelectric effect.
Why does the photoelectric effect dominate at low energy gamma rays?
The photoelectric effect dominates at low-energies of gamma rays. The photoelectric effect leads to the emission of photoelectrons from matter when light ( photons) shines upon them. The maximum energy an electron can receive in any one interaction is hν.
What is Einstein’s interpretation of the photoelectric effect?
Einstein’s interpretation of the photoelectric effect results in equations which are valid for visible and ultraviolet light: No electron will be emitted if the incident photon’s energy is less than the work function. where m is the rest mass of the particle and c is the velocity of light in a vacuum.