What is threshold frequency stopping potential and work function?

What is threshold frequency stopping potential and work function?

Threshold Frequency: The threshold frequency is that minimum frequency of light below which the photoelectrons do not emit. Work function: The least energy which can eject the electrons from the surface of the metal.

What is stopping potential?

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.

What is meant by threshold frequency?

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

What is difference between threshold frequency and stopping potential?

Threshold frequency is the minimum frequency of the incident light which can cause the ejection of electrons without giving them additional energy. The amount of potential that is required to stop the electron having the maximum kinetic energy from moving is known as stopping potential.

What is difference between threshold frequency and work function?

The minimum frequency of the incident light at which the emission of the electrons starts is called the threshold frequency. It is different for different materials. The minimum energy necessary to initiate the photoelectric effect from the metal surface is called the work function.

What is the use of stopping potential?

Answer: Stopping potential or cut-off potential is defined as the required potential for stopping the removal of an electron from a metal surface when the incident light energy is greater than the work potential of the metal on which the incident light is focused.

Why is the stopping potential negative?

A negatively charged electron is repelled from a negatively charged plate, and to climb ‘up’ that potential to reach the plate requires e×V energy (conveniently given in eV!). So, a positively charge plate will attract all emitted electrons, regardless of their kinetic energy upon leaving the solid.

What does E stand for in stopping potential?

The potential at which this occurs is called the stopping potential . It is a measure of the maximum kinetic energy of the electrons emitted as a result of the photoelectric effect.

What is the threshold frequency symbol?

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 =…

What is the threshold value?

[′thresh‚hōld ‚val·yü] (computer science) A point beyond which there is a change in the manner a program executes; in particular, an error rate above which the operating system shuts down the computer system on the assumption that a hardware failure has occurred.

What does the slope of the line between stopping potential and frequency represent?

What does the slope of the line between stopping potential and frequency represent? The slope represents the work function.

When is the value of stopping potential high?

When the frequency of incident light is higher the value of stopping potential also becomes high. The unit of stopping potential is volt. In the photoelectric experiment, light is focused on a metal plate and if the frequency of light is sufficient enough, electrons are ejected from the surface.

What is the stopping potential of a metal?

Stopping potential or cut-off potential is defined as the required potential for stopping the removal of an electron from a metal surface when the incident light energy is greater than the work potential of the metal on which the incident light is focused.

What is work function, threshold frequency and stopping?

Exercise : A small plate of a metal (work function = 1.17 eV) is placed at a distance of 2 m from a monochromatic light source of wavelength 4.8 x 10 -7 m and power 1.0 watt. The light falls normally on the plate. Find the number of photons striking the metal plate per square metre per second.

How to define the stopping potential of radiation?

Define stopping potential (cut-off potential) with reference to photoelectric effect. 1 Stopping potential does not depend on the intensity of incident radiation. On increasing intensity, the value of… 2 For a given intensity of radiation, the stopping potential depends on the frequency. Higher the frequency of incident… More