What is φ in photoelectric effect?
where phi is the work function of the metal; it represents the minimum energy which must be supplied to release an electron from the metal. For convenience, this work function is normally measured in units of electronvolts (eV): 1 eV = 1.6 ´ 10^-19 J .
How do you demonstrate the photoelectric effect?
Which is the correct graphical representation based on photoelectric effect?
The correct graphical representation based on photoelectric effect is (4) II and IV. This is because the graph between Kinetic Energy and light frequency v is a straight line which does not pass through origin but has a frequency threshold v0.
What does the slope of the graph between stopping potential and frequency?
The slope of graph b/w stopping potential and frequency is eh, where e is charge of electron.
What are the three laws of photoelectric effect?
Characteristics Of Photoelectric Effect The photoelectric current is directly proportional to the light intensity. The kinetic energy of the photoelectrons is directly proportional to the light frequency. The stopping potential is directly proportional to the frequency and the process is instantaneous.
What is photoelectric effect example?
Imagine a marble circling in a well, which would be like a bound electron to an atom. When a photon comes in, it hits the marble (or electron), giving it enough energy to escape from the well. This explains the behavior of light striking metal surfaces.
What are the main features of photoelectric effect?
The photoelectric effect has three important characteristics that cannot be explained by classical physics: (1) the absence of a lag time, (2) the independence of the kinetic energy of photoelectrons on the intensity of incident radiation, and (3) the presence of a cut-off frequency.
What is PHI in wave equation?
You can calculate it as the change in phase per unit length for a standing wave in any direction. It’s typically written using “phi,” ϕ. You can use it to calculate how many oscillations a wave has undergone through its cycles. To calculate the phase constant of a wave, use the equation 2π/λ for wavelength “lambda” λ.
What is Ke formula?
Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.
What is the symbol of work function?
Work Function Definition The work function (or workfunction) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. The symbol for work function is Φ (uppercase Phi of the Greek alphabet).
What is the conclusion of photoelectric effect?
Each of the photons interacts with one electron. The energy of the incident photon is used in liberating the electrons from the surface and to impart energy to the ejected electrons.
What does the photoelectric effect experiment show?
The photoelectric effect proves that light has particle-like activity. The photoelectric effect happens when photons are shone on metal and electrons are ejected from the surface of that metal. The electrons that are ejected are determined by the wavelength of light which determines the energy of photons.
What are the observations in the experiment on photoelectric effect?
The two main observations are: (i) The maximum kinetic energy of emitted photoelectrons is independent of light intensity. (ii) For each photoelectron, there must be a threshold frequency of incident light below which no emission takes place.
What are the 4 graphical representation?
This form of representation is seen in a frequency distribution that is represented in four methods, namely Histogram, Smoothed frequency graph, Pie diagram or Pie chart, Cumulative or ogive frequency graph, and Frequency Polygon.
What are the 4 different types of graphical representation?
- Line Graphs.
- Bar Graphs.
- Line Plots.
- Frequency Table.
- Circle Graph, etc.
How do you draw a graphical representation of motion?
Summary. Motion can be represented by a position-time graph, which plots position relative to the starting point on the y-axis and time on the x-axis. The slope of a position-time graph represents velocity. The steeper the slope is, the faster the motion is changing.
What is the significance of the slope of graph of stopping potential of an emitter verses frequency of incident radiation?
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 effect of frequency in stopping potential explain with graph?
Greater the frequency of the incident radiation, larger is the corresponding stopping potential. This implies that as the frequency is increased, the photoelectrons are emitted with greater kinetic energies so that the retarding potential needed to stop the photoelectrons is also greater.
What is the relationship between frequency and stopping potential?
For a given intensity of radiation, the stopping potential depends on the frequency. Higher the frequency of incident light higher the value of stopping potential.
What is Einstein equation of photoelectric effect?
E = W + KE. hv = W + KE. KE = hv – w. At the threshold frequency, ν0 electrons are just ejected and do not have any kinetic energy. Below this frequency, there is no electron emission.
How does wave theory fail to explain the photoelectric effect?
The photoelectric effect cannot be explained by the wave model due to the following reasons: The energy of a wave increases with an increase in intensity. However, in the photoelectric effect, increase in intensity has no effect on the energy of electrons emitted.
What is Einstein theory of photoelectric effect?
Light, Einstein said, is a beam of particles whose energies are related to their frequencies according to Planck’s formula. When that beam is directed at a metal, the photons collide with the atoms. If a photon’s frequency is sufficient to knock off an electron, the collision produces the photoelectric effect.
What is photoelectric in simple words?
Definition of photoelectric : involving, relating to, or utilizing any of various electrical effects due to the interaction of radiation (such as light) with matter.