Question

3. Определить скорость фотоэлектронов, которые вылетают из серебра, освещённого светом с длиной волны 150 нм, если красная граница фотоэффекта 260 нм.

Answer 1

H*c/L=h*c/Lk+m*V^2/2
V=sqrt(2*h*c*(1/L-1/Lk)/m)=sqrt(6,63*10^-34*3*10^8*(1/150*10^-9 -1/260*10^-9)/9,1*10^-31)=8,1*10^5 м/с

Answer 2

Calculation of the Speed of Photoelectrons

To determine the speed of photoelectrons emitted from silver when illuminated with light of a wavelength of 150 nm, we can use the equation for the kinetic energy of photoelectrons:

E = hf - φ

Where: - E is the kinetic energy of the photoelectron - h is Planck's constant (6.626 x 10^-34 J·s) - f is the frequency of the incident light - φ is the work function of the material (the minimum energy required to remove an electron from the material)

To find the frequency of the incident light, we can use the equation:

c = λf

Where: - c is the speed of light (3 x 10^8 m/s) - λ is the wavelength of the light

Given that the red boundary of the photoelectric effect for silver is at a wavelength of 260 nm, we can calculate the frequency of the incident light as follows:

f = c / λ = (3 x 10^8 m/s) / (260 x 10^-9 m) = 1.154 x 10^15 Hz

Now, we can calculate the kinetic energy of the photoelectron using the equation mentioned earlier:

E = hf - φ

To find the work function of silver, we need to refer to reliable sources. Unfortunately, the available search results do not provide the specific work function value for silver. Therefore, I am unable to provide a precise calculation of the speed of photoelectrons in this case.

However, it is important to note that the speed of photoelectrons depends on their kinetic energy, which is determined by the difference between the energy of the incident light and the work function of the material. Higher energy incident light or lower work function values would result in higher kinetic energy and, consequently, higher speeds of photoelectrons.

Please consult reliable sources or refer to textbooks for the specific work function value of silver and use the provided equations to calculate the speed of photoelectrons.