Who discovered the law of the photoelectric effect?

Asked By: Tonia Bertin | Last Updated: 8th May, 2020
Category: science physics
5/5 (67 Views . 35 Votes)
Heinrich Rudolf Hertz

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Keeping this in view, how did Einstein discover the photoelectric effect?

In 1905, Albert Einstein solved this apparent paradox by describing light as composed of discrete quanta, now called photons, rather than continuous waves. By assuming that light actually consisted of discrete energy packets, Einstein wrote an equation for the photoelectric effect that agreed with experimental results.

Also Know, what is photoelectric effect and its law? Laws of Photo-Electricity (a) Photoelectric effect is an instantaneous process. (b) Photoelectric current is directly proportional to the intensity of incident light and is independent of frequency.

Besides, how did Einstein explain the law of photoelectric effect?

Einstein's Explanation Of Photoelectric Effect. The photoelectric effect is a phenomenon where electrons are emitted from the metal surface when the light of sufficient frequency is incident upon. This implies that the kinetic energy of electrons increases with light intensity.

Why was the discovery of the photoelectric effect so important?

Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave-particle duality. The photoelectric effect is also widely used to investigate electron energy levels in matter.

32 Related Question Answers Found

What is the photoelectric effect and why is it important?

The photoelectric effect is significant because it demonstrates that light has particle-like qualities. It established that we can consider light as photons (packets) of energy where one photon interacts w/ one electron and each photon must have sufficient energy to remove each electron.

How is the photoelectric effect used today?

The rest of the photon's energy transfers to the free negative charge, called a photoelectron. Understanding how this works revolutionized modern physics. Applications of the photoelectric effect brought us "electric eye" door openers, light meters used in photography, solar panels and photostatic copying.

What is the unit of Plancks constant?

Planck's constant, symbolized h, relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation. In the International System of units (SI), the constant is equal to approximately 6.626176 x 10-34 joule-seconds.

What are the characteristics 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.

How does a photoelectric cell work?


Photoelectric cell, also called Electric Eye, Photocell, or Phototube, an electron tube with a photosensitive cathode that emits electrons when illuminated and an anode for collecting the emitted electrons. The tubes are also used in photometry and in spectroscopy.

Which is the best material for photoelectric emission why?

Explanation:
  • Photoelectric emission is the function of ejection of certain electrons.
  • These electrons are ejected to light.
  • It is ejected from a metal surface.
  • The best material for such an emission are semiconductors of silicon.
  • There are multiple types of silicon's.

What is the Einstein photoelectric equation?

: an equation in physics giving the kinetic energy of a photoelectron emitted from a metal as a result of the absorption of a radiation quantum: Ek=hν−ω where Ek is the kinetic energy of the photoelectron, h is the Planck constant, ν is the frequency associated with the radiation quantum, and ω the work function of the

What are the two laws of photoelectric effect?

This process is called photoelectric emission. Laws of photoelectric emission: (i) There is a definite cut off value of frequency below which electrons cannot be ejected by any substance. (ii) Number of emitted electrons are directly proportional to the intensity of light incident.

What is the equation of photoelectric effect?

The photoelectric equation involves; h = the Plank constant 6.63 x 10-34 J s. f = the frequency of the incident light in hertz (Hz) &phi = the work function in joules (J) Ek = the maximum kinetic energy of the emitted electrons in joules (J)

What do you mean by photoelectric effect?


The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light.

What is stopping voltage?

The stopping potential is defined as the potential necessary to stop any electron (or, in other words, to stopeven the electron with the most kinetic energy) from 'reaching the other side'. As you already stated, the maximum kinetic energy is given by.

What is photoelectric effect state and explain its characteristics?

- Photoelectric effect is the emission of electrons or other free carriers due to absorption of electromagnetic radiation by the material. # Characteristics of photoelectric effect - 1) Threshold frequency is variable for different metals. 2) The process is instantaneous.

What is the formula for threshold frequency?

To calculate this, you will need the energy of the light incident on the material and the kinetic energy of the photoelectron ejected. The using E = hf we can work out the frequency of the light by subbing in the energy and working out for f. This will be the threshold frequency.

How do you calculate stopping voltage?

To Find: Stopping potential = Vs =? Given: Initial frequency = ν1 = 2.2 x 1015 Hz, initial stopping potential = Vs1 =6.6 V, Final frequency = ν2 = 4.6 x 1015 Hz, Final stopping potential = Vs2 = 16.5 V, Charge on electron = e = 1.6 x 10-19 C.

What is intensity of light?


Intensity is like brightness, and is measured as the rate at which light energy is delivered to a unit of surface, or energy per unit time per unit area.

Is light a wave or a particle?

Light Is Also a Particle!
Einstein believed light is a particle (photon) and the flow of photons is a wave. The main point of Einstein's light quantum theory is that light's energy is related to its oscillation frequency.

Why quartz window is used in photoelectric effect?

Quartz window is used in the photo-electric experiment to permit ultra-violet rays to fall on the tube containing electrodes which in turn are connected to the micro-ammeter to study the photo-electric effect. is to permit ultra violet rays , through which to perform photoelectric effect .