Question

1)Найти энергию связи урана. Помгитее срочно 2) работа выпада электронов 4,5 эВольт. Запирающее напряжение 4 Вольта. Найти частоту излучения и длину волны

Answer 1

1. E связи = ΔM*C²
ΔM = 92*1,007 а.е.м. + 146*1,008 а.е.м. - 238,03 а.е.м.
ΔM= 92,644+147,168 - 238,03 = 1,782 а. е. м.
Е связи = 1,782 * 1,66 * 10⁻²⁷ * (3*10⁸)² = 27*10⁻¹¹ Дж.
Е связи = 16,875 * 10⁸ = 1687,5 МэВ.

2. Используя уравнение Эйнштейна для фотоэффекта:
hν=Aвых.+Ек. ,где Eк. = Uз*e
hν=Aвых.+ Uз*e
ν=(Aвых.+ Uз*e)/h
ν=(4,5*1,6*10⁻¹⁹ + 4*1,6*10⁻¹⁹)/6,6*10⁻³⁴
ν=(7,2*10⁻¹⁹ + 6,4*10⁻¹⁹)/6,6*10⁻³⁴  ≈ 2*10¹⁵ Гц.
λ=С/ν
λ=3*10⁸ / 2*10¹⁵ = 1,5*10⁻⁷ м = 150нм.

Answer 2

Energy of Uranium Bond

The energy of a uranium bond refers to the amount of energy required to break the bond between two uranium atoms. The energy of a chemical bond is typically measured in units of electron volts (eV). However, it is important to note that uranium primarily forms metallic bonds, which are not easily quantified in terms of a specific bond energy value. Metallic bonds are characterized by a delocalized "sea" of electrons that are shared among all the atoms in the metal lattice.

Electron Work Function and Stopping Voltage

The work function of a material is the minimum amount of energy required to remove an electron from the surface of the material. In the given scenario, the work function is 4.5 eV, and the stopping voltage is 4 volts. The stopping voltage is the minimum voltage required to stop the flow of electrons in a photoelectric effect experiment.

To find the frequency of the emitted radiation and the wavelength, we can use the equation:

E = hf

where: - E is the energy of a photon (in electron volts) - h is Planck's constant (4.135667696 x 10^-15 eV s) - f is the frequency of the radiation (in hertz)

We can rearrange the equation to solve for the frequency:

f = E / h

Substituting the given energy value of 4.5 eV and Planck's constant, we can calculate the frequency:

f = 4.5 eV / (4.135667696 x 10^-15 eV s)

Calculating this value gives us the frequency of the emitted radiation.

To find the wavelength, we can use the equation:

c = λf

where: - c is the speed of light (approximately 3 x 10^8 meters per second) - λ is the wavelength of the radiation (in meters)

We can rearrange the equation to solve for the wavelength:

λ = c / f

Substituting the calculated frequency into the equation, we can find the wavelength.

Please note that the given values are in electron volts, so the resulting frequency and wavelength will also be in electron volts. If you would like the values in different units, please let me know.

Let's calculate the frequency and wavelength using the given values.