Sinc, kinetic energy of electrons = 1.68 x 10 5 J. So, minimum energy required to remove 1 mole of electrons from sodium = (3.99 x 105 )- (1.68 x 105) = 2.31 x 105 J. Hence, minimum energy required to remove one electron = 2.31 x 105/ 6.022x 1023 =3.84 x 10-19 J.

Solution: From the previous problem, the energy of a single 400 nm photon is 3.1 eV.

3.3e

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68×10 Jmol−1.

400 nm

The wavelength corresponding to 4.2 eVis 295.3 nm, which is the longest wavelength that can cause photoelectrons to be ejected. If 200 nm light falls on it its energy is 6.2 eV. Thus the maximum kinetic energy of emitted photoelectrons is (6.2-4.2)= 2 eV.

To determine the maximum wavelength of light, you simply use the energy equation. If you know the amount of energy required for the reaction, you plug it into the equation λ = hc/E.

: the minimum frequency of radiation that will produce a photoelectric effect.

The maximum kinetic energy (Kmax) of the photoelectrons (with charge e) can be determined from the stopping potential (V0). When charge (e) is given in coulombs, the energy will be calculated in joules….equations.

At the limiting frequency called the ” threshold frequency “, the kinetic energy of the released electron is zero. Setting KE = 0 and replacing f by fth, we get: h fth = Wo or fth = Wo / h. The above formula gives the threshold frequency, fth .

At zero stopping potential the frequency of incident radiation is more to metal A. Both the metals have the same stopping potential at different frequencies and this frequency is more than metal A. So, metal A has a higher threshold frequency. Thus, metal A has high threshold frequency.

The photoelectric effect is a phenomenon that occurs when light shined onto a metal surface causes the ejection of electrons from that metal. This minimum frequency needed to cause electron ejection is referred to as the threshold frequency.

electromagnetic phenomena The photoelectric threshold frequency, symbolized by the Greek letter nu with subscript zero, ν0, is that frequency at which the effect is barely possible; it is given by the ratio of the work function symbolized by the Greek letter psi, ψ, to Planck’s constant (ν0 =…

The threshold frequency is defined as a minimum frequency under which the photoelectric emission is not possible, regardless of the incident radiation intensity.

The threshold frequency is the frequency of light that carries enough energy to dislodge an electron from an atom. This energy is entirely consumed in the process (see References 5). Therefore, the electron gets no kinetic energy at the threshold frequency and it is not released from the atom.

The threshold frequency is defined as the minimum frequency of incident radiation below which the photoelectric emission is not possible completely.

Electronics. In electronics, cutoff frequency or corner frequency is the frequency either above or below which the power output of a circuit, such as a line, amplifier, or electronic filter has fallen to a given proportion of the power in the passband.

Threshold frequency v0​ is the minimum frequency which a photon must possess to eject and electron from a metal. It is different for different metals. When a photon of frequency 1.

In mathematical terms, ϕ=hf−K, where ϕ is the work function and K is the kinetic energy of the electron. Thus the work function has been calculated without having to know the threshold frequency.

Work functions depend on the structure and chemical composition of a surface. For example, different crystallographic surfaces of the same metal or compound can have substantially different work functions. Chemical modifications of a surface can have even larger consequences.

platinum

The ionization energy of the elements increases as one moves up a given group because the electrons are held in lower-energy orbitals, closer to the nucleus and thus more tightly bound (harder to remove). Based on these two principles, the easiest element to ionize is francium and the hardest to ionize is helium.

Re: Removing 2nd Electron It becomes harder to remove an electron when an atom has a net positive charge because the attraction that the nuclear charge exerts per electron gets larger. For example, if you have a neutral nitrogen atom, it has 7 electrons.

The stopping voltage (or stopping potential) refers to the voltage difference required to stop electrons from moving between plates and creating a current in the photoelectric experiment. The product of the charge on an electron and the stopping voltage gives us the maximum kinetic energy of that ejected electron.

The alkali metals in group 1 are the most active metals, and cesium is the last element in the group for which we have experimental data. Francium is extremely rare and is radioactive, with the longest half-life at 22 min, so there is no empirical evidence that francium is the most metallic element.

If we look at the periodic table group 17 and group 18 have the least or lowest metallic character. Now if we analyze the trends in the periodic table metallic character decreases as you move from left to right and from bottom to top of the periodic table.

Properties of metals

• high melting points.
• good conductors of electricity.
• good conductors of heat.
• high density.
• malleable.
• ductile.