How does quantum theory explain the photoelectric effect?

How does quantum theory explain the photoelectric effect?

Photoelectric effect can only be explained by the quantum concept of radiation. 1) The photocurrent is proportional to the intensity of incident radiation. 2) The magnitude of stopping potential and hence the maximum kinetic energy of emitted photoelectrons is proportional to the frequency of emitted radiation.

How do you explain the photoelectric effect?

Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.

What is photoelectric effect PDF?

The phenomenon of emission of electrons from mainly metal surfaces exposed to light energy (X ” rays, γ ” rays, UV rays, Visible light and even Infra Red rays) of suitable frequency is known as photoelectric effect.

How photoelectric effect is explained on the basis of quantum and classical theory?

Quantum theory of light can explain the photoelectric effect that if a quanta of photon is incidented on the metal surface, the energy of photon breaks the electron-nucleus interaction and thus an electron is emitted from the metal surface.

What are the applications of photoelectric effect?

Applications of the photoelectric effect brought us “electric eye” door openers, light meters used in photography, solar panels and photostatic copying

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Which material is used in photoelectric effect?


The photoelectric effect is a phenomenon in physics. The effect is based on the idea that electromagnetic radiation is made of a series of particles called photons. When a photon hits an electron on a metal surface, the electron can be emitted. The emitted electrons are called photoelectrons.

Because of low ionization enthalpy of potassium and caesium as compared to lithium, they are able to lose their outermost electron when exposed or irradiated with light. This property makes caesium and potassium useful in photoelectric cells

Is Na used in photoelectric cell?

Answer. (D) Csmetal is used in photoelectric cell. Photoelectric cell, which is also commonly called as electricEye, or Phototube, is basically an electron tubewith a photosensitive cathode that emits electrons when illuminated. The anode collects the emitted electrons

Why is sodium metal used in photoelectric effect?

This is because the valence electron are loosely bound to the nucleus of atom and are easily liberated by absorbing small amount of energy. Was this answer helpful?

Why lithium is not used in photoelectric cells?

When alkali metals are exposed to light, they lose electrons. On exposure to light, caesium can easily emit electrons. But in case of Lithium, due to high ionisation enthalpy of lithium, it is very difficult to lose electrons. Therefore, we cannot use Li in photoelectric cells.

Is rubidium used in photoelectric cells?

Rubidium forms two other oxides (Rb2O and Rb2O3). It is used in photoelectric cells and as a “getter” in electron tubes to scavenge the traces of sealed-in gases. Rubidium forms a number of mercury amalgams.

Why is rubidium so reactive?

Answer: Rubidium (Rb) is more reactive because it is further to the left than strontium (Sr).

Why is rubidium so expensive?

Rubidium is a rare and expensive metal with few uses. Ironically, its rarity in part is due to there being few recipes that mark Rb as an important ingredient.

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How is rubidium produced?

Today, most rubidium is obtained as a byproduct of refining lithium. Rubidium is used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. It is also used in the manufacture of photocells and in special glasses.


Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air.

What is an interesting fact about rubidium?

Rubidium Trivia They named their new element rubidium after the Latin word rubidus meaning ‘deepest red’. Rubidium is the second most electropositive element. Rubidium can be used to give fireworks a red-violet color. Rubidium is the 23rd most abundant element in the Earth’s crust

How is rubidium used in everyday life?

Rubidium is used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. It is also used in the manufacture of photocells and in special glasses. Since it is easily ionized, it might be used as a propellant in ion engines on spacecraft.

Who found rubidium?

Robert Bunsen

Is silicon a metal?

Silicon is neither metal nor non-metal; it’s a metalloid, an element that falls somewhere between the two. The category of metalloid is something of a gray area, with no firm definition of what fits the bill, but metalloids generally have properties of both metals and non-metals

What are 3 uses of silicon?

Uses of Silicon

Why is silicon so important?

Silicon is used for electronic devices because it is an element with very special properties. One of it’s most important properties is that it is a semiconductor. This means that it conducts electricity under some conditions and acts as an insulator under others

What Colour is silicon?

Pure silicon is a hard, dark gray solid with a metallic lustre and with a octahedral crystalline structure the same as that of the diamond form of carbon, to which silicon shows many chemical and physical similarities

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In short, silicon is a naturally occurring chemical element, whereas silicone is a synthetic substance. Silicon is the 14th element on the periodic table. It’s a metalloid, meaning it has properties of both metals and nonmetals, and is the second most abundant element in the Earth’s crust, after oxygen

The Physical Properties of Silicon are as follows:

How is silicon used in everyday life?

Silicone is used in building and construction, able to bond materials such as concrete, glass, granite, steel and plastics, enabling them to work better and last longer. These silicone sealants can absorb pressure and movement within engineering, allowing for more innovative architectural designs

Is silicon used in medicine?

Silicon supplements are used as medicine. Silicon is used for weak bones (osteoporosis), heart disease and stroke (cardiovascular disease), Alzheimer’s disease, hair loss, and improving hair and nail quality

Where is silicon used in everyday life?

Silicones in Everyday Life

What is silicon used for in construction?

Silicon resins are used in the construction industry as additions to coatings to which they impart resistance to heat, oils, salts, acids, and alkalis. Because they also provide water repellence, they are used in water repellent treatments for brickwork and masonry.

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