What is the maximum kinetic energy of ejected electron in Joule?

This value is the maximum possible kinetic energy of the photoelectron. The equation, which Einstein determined, says (electron’s maximum kinetic energy) = (energy of the incident light energy packet) minus (the work function). For the example, the electron’s maximum kinetic energy is: 2.99 eV – 2.75 eV = 0.24 eV.

How do you find the maximum kinetic energy of photoelectric?

Definition: The Maximum Kinetic Energy of a Photoelectron given Frequency. The maximum kinetic energy of a photoelectron is given by ? = ℎ ? − ? , m a x where ℎ is the Planck constant, ? is the frequency of the incident photon, and ? is the work function of the metal surface.

Why do emitted electrons have a maximum kinetic energy?

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. Below the threshold frequency photoemission does not occur.

Which of the following would increase the maximum kinetic energy of the ejected electrons?

The maximum kinetic energy of the emitted electron increases as the frequency of the incident light increases. 2. The number of electrons emitted is proportional to the intensity of the incident light.

What is the maximum kinetic energy of photoelectrons?

What is the maximum kinetic energy of the ejected photoelectrons? Violet light of wavelength 400 nm ejects electrons with a maximum kinetic energy of 0.860 eV from sodium metal.

What is kinetic energy formula?

In classical mechanics, kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

What is the kinetic energy of electron?

Re: Kinetic Energy of Electrons [ENDORSED] Then, we can use the equation for kinetic energy (KE = 1/2 mv2) and substituting in the mass of an electron (9.11 x 10-31 kg), we can calculate the velocity for the single electron.

What is the minimum energy required to remove an electron?

This term is also related with photoelectric effect as discussed in option (A), So, Work function is defined as the minimum amount of energy needed to remove an electron from the atom. So, the minimum energy required to remove an electron is called the Work function.

What is the formula of kinetic energy maximum?

The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe = hf − BE, where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.

What factors s affect kinetic energy?

The two main factors that affect kinetic energy are mass and speed. Why? Because the motion of an object depends on how fast it’s traveling, but also how much mass it has, though velocity is the more important factor.

Why is t used for kinetic energy?

Kinetic energy is sometimes represented by the letter T. This probably comes from the French travail mécanique (mechanical work) or quantité de travail (quantity of work).

Which is the maximum kinetic energy of an ejected electron?

The maximum kinetic energy KE e of ejected electrons (photoelectrons) is given by KE e = hf − BE, where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material. Is visible light the only type of EM radiation that can cause the photoelectric effect?

How long does it take for an electron to be ejected?

As soon as an individual photon of a sufficiently high frequency is absorbed by an individual electron, the electron is ejected. If the EM radiation were a simple wave, several minutes would be required for sufficient energy to be deposited to the metal surface to eject an electron.

How is the kinetic energy of a photoelectron determined?

Determine the maximum kinetic energy of photoelectrons ejected by photons of one energy or wavelength, when given the maximum kinetic energy of photoelectrons for a different photon energy or wavelength. When light strikes materials, it can eject electrons from them.

How is the Ke related to the intensity of light?

The KE of the electrons is independent of the intensity of the light. More intense light will dislodge more electrons, so the current will increase, but the kinetic energy of the electrons will all be limited to the same value (the maximum kinetic energy). Exercise Calculate the maximum KE and velocity