Which principle is used in photocell?

The photocell is a device that works on the principle of the photoelectric effect. A photocell converts light energy to electric energy. The photons with suitable frequency will remove electrons from the metal surface.

What is the conclusion of photocell experiment?

The results of the experiment agreed with the major points of the theory and yielded a value for Planck’s constant within ten per cent of accepted value. It was concluded that a photocell experiment can be per- formed in secondary schools which will yield results which agree with the theory.

How does a photocell work physics?

Photoelectric cell or photocell or photovoltaic cell is an electronic device which works on the principle of the photoelectric effect and converts light energy into electrical energy. Photocell consists of an evacuated glass tube containing two electrodes emitter (C) and Collector (A).

What is the energy of the incident light?

We can think of the incident light as a stream of photons with an energy determined by the light frequency. When a photon hits the metal surface, the photon’s energy is absorbed by an electron in the metal.

What is the response time of photocell?

At 1 fc of illumination the response times are typically in the range of 5 msec to 100 msec. The speed of response depends on a number of factors including light level, light history, and ambient temperature.

What is photocell and its types?

Solution : Photo electric cell or photo cell is a device which converts light energy into electrical energy . It works on the principle of photo electric effect. Photo cells are classified into three types. They are
(i) Photo emissive cell
(ii) Photo voltaic cell
(iii) Photo conductive cell.

What is the purpose of using photocell in this experiment?

The photocell experiment is designed to measure the stopping potential on the anode (collector) that stops the flow of electric current from the cathode by applying a negative potential on the anode.

What are the characteristics of a photocell?

Photo-Emissive Cell: There are two types of photo-emissive cells; Vacuum type or gas filled type cells. Generally, it consists of two electrodes i.e. cathode (K) and anode (A). The cathode is in the form of semi-cylindrical plate coated with photo-sensitive material like sodium potassium or cesium i.e. alkali metals.

What is wavelength in photoelectric effect?

The minimum energy required to eject an electron from the surface is called the photoelectric work function. The threshold for this element corresponds to a wavelength of 683 nm. Using this wavelength in the Planck relationship gives a photon energy of 1.82 eV.

How many types of photocells are there?

There are, essentially, three types of photoelectric cell; the photoemissive cell, the photovoltaic cell, and the photoconductive cell.

What are the applications of a photocell?

  • Photoelectric cells are used in TV camera for telecasting scenes.
  • These cells are used for the reproduction of sound along with pictures in cinema.
  • Photocells are used in counting devices.
  • These cells are also used in burglar alarm and in fire alarm.

Which metal is used in photoelectric cell?

One of the most popular metal with such characteristics used in photoelectric cells is Cesium (Cs). It is an alkali metal belonging to group 1. Caesium (Cesium) is widely and commonly used in photoelectric cells because it can easily convert sunlight into electricity.

What does light intensity depend on?

Amplitude is the maximum displacement of the particles of the wave. Therefore, The intensity of the light directly proportional to the square of the amplitude. Hence, The intensity of light depends on the amplitude.

Which process depends on the intensity of incident light?

In a photoelectric emission process, the maximum energy of the photoelectrons increases with increasing intensity of the incident light.

What is the formula of photoelectric effect?

By conservation of energy, this reasoning led Einstein to the photoelectric equation Ek = hf − ϕ, where Ek is the maximum kinetic energy of the ejected electron.

Is a photocell an LDR?

A photoresistor (also known as a Photocell, or light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases resistance with respect to receiving luminosity (light) on the component’s sensitive surface.

What is a photocell made of?

The photocell’s semiconductor material is typically cadmium sulfide (CdS), but other elements are also used. Photocells and photodiodes are used for similar applications; however, the photocell passes current bi-directionally, whereas the photodiode is unidirectional.

What are the components of photocell?

The photocell used in the circuit is named as dark sensing circuit otherwise transistor switched circuit. The required components to build the circuit mainly include breadboard, jumper wires, battery-9V, transistor 2N222A, photocell, resistors-22 kilo-ohm, 47 ohms, and LED.

How is photocell connected?

Connect one black wire on the photocell to the black wire that comes from the building. Be sure to twist the exposed copper wire so that it forms a tight connection. Connect the second black wire on the photocell to the black wire on your light fixture, making sure that the copper wire is twisted together completely.

Is solar cell a photocell?

Solar cell is a photoelectric cell, which converts light energy into electrical energy.

Who invented the photocell?

In 1883 the American inventor Charles Fritts created a working photoelectric cell; that same year a German engineer, Paul Nipkow, used a photoelectric cell in his “Nipkow’s disk”—a device which could take a picture by measuring the lighter and darker areas on an object and translate them into electrical impulses.

Does a photocell need electricity?

There are several types of photocells available, but they all use the same underlying technology, semiconductors, to control electric current. Under normal conditions, semiconductors won’t conduct electricity, but when they’re exposed to enough light, current starts to flow.

What sensitive material is used in photocell for visible light?

Materials used as the semiconductor substrate include, lead sulphide (PbS), lead selenide (PbSe), indium antimonide (InSb) which detect light in the infra-red range with the most commonly used of all photoresistive light sensors being Cadmium Sulphide (Cds).

Which device measures the response of photocell?

Answer: A device used for measuring a response of photocell is called- a photoelectric cell. Explanation: A photocell or a photoconductive cell is a solid-state electronic device used to detect and measure light and radiations.

What is cathode and anode in photocell?

Anode and cathode are defined according to the direction in which charge-carriers move in the device itself, be it a battery or photocell, or a passive device such as a diode. The anode is the electrode towards which negative carriers move (or away from which positive carriers move); vice versa for the cathode.

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