What is the relation between stopping potential and frequency?
The stopping potential does not depend on the intensity nor the number of incident photons but the stopping potential depends on the frequency of the incident light, the higher the frequency of the incident light higher the stopping potential or cut potential. It also depends on the kinetic energy of the electrons.
What is the slope of graph of stopping potential versus frequency?
The slope of graph b/w stopping potential and frequency is eh, where e is charge of electron.
How will the stopping potential change if the frequency?
Thus stopping potential increases with increase in frequency of incident radiation.
How the Planck’s constant can be found from a stopping potential V’s frequency graph?
Solution : The value of Planck. s constant can be determined from the above graph as `tan theta = h/e` `h = e tan theta` `h = e xx ` Slope of `(V_s – f)` graph.
What is the significance of slope of graph of stopping potential of an ammeter versus frequency of incident radiation?
1 Answer. The slope of graph of stopping potential of an emitter verses frequency of incident radiation is observed to be a constant. The value of slope is measured to be h/e which is independent of nature of emitter.
What is the value of stopping potential at threshold frequency?
∴ Stopping potential =0.
How does stopping potential vary with the frequency of light causing photoelectric effect?
The stopping potential Vc is found to be changing linearly with frequency of incident light being more negative for high frequency. An increase in frequency of the incident light increases the kinetic energy of the emitted electrons, so greater retarding potential is required to stop them completely.
Why stopping potential does not depend on the intensity of light having same frequency?
The stopping potential does not change with the radiation intensity because the kinetic energy of photoelectrons (see (Figure)) does not depend on the radiation intensity.
How is the Planck’s constant determined from the graph?
The value for Planck’s constant is the slope of your graph multiplied by e/c where e is the electronic charge (1.6022 x 10-19 C) and c is the velocity of light (2.998 x 108 m/s).
How do you find the Planck’s constant from stopping potential and wavelength?
Planck’s constant can be found through the equation: E = h * frequency = KE(max) + Wo which can be rewritten in the form V(stopping) = h/e * f + Wo/e , the equation of a line with slope equal to h/e. Multiplying by the value for e, one may calculate the value of h, Planck’s constant.
What is stopping potential in photoelectric effect?
Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
What is stopping potential formula?
Given: Stopping potential = Vs = 2 V, wavelength of incident light = λ = 160 nm = 160 x 10-9 m, Threshold wavelength = λo = 240 nm = 240 x 10-9 m, speed of light = c = 3 x 108 m/s, Planck’s constant = h = 6.63 x 10-34 Js, Charge on electron = e = 1.6 x 10-19 C.
How do you find frequency when given wavelength and stopping voltage?
Find the threshold wavelength of the material of cathode. Given: Stopping potential = Vs = 2 V, wavelength of incident light = λ = 2000 Å = 2000 x 10-10 m, speed of light = c = 3 x 108 m/s, Planck’s constant = h = 6.63 x 10-34 Js, Charge on electron = e = 1.6 x 10-19 C. To Find: frequency of radiation = ν =?
What happens when frequency is equal to threshold frequency?
Light with frequency equal to threshold frequency will eject the electron without any release of kinetic energy. If the frequency of light is more than the threshold frequency, kinetic energy is released with ejecting the electron.
What is the value of stopping potential?
Solution : Stopping potential is that negative potential for which photo electric current is zero.
Why does stopping potential increase with increase in frequency?
Solution : By increasing the frequency of incident light energy of incident light will increase. So, maximum kinetic energy of photoelectrons will also increase. Hence, stopping potential will increase.
Why does stopping potential depend on frequency?
The stopping potenial depends on frequency of incident light and nature of the emitter material. for a given frequency of incident light, it is independent of its intensity.
How stopping potential vary with frequency for A and B?
The stopping potential is varying with frequency of incident light. An increase in frequency of the incident light will increase the kinetic energy of the emitted electrons, therefore greater retarding potential is needed to stop them.