This is because the valence electron are loosely bound to the nucleus of atom and are easily liberated by absorbing small amount of energy .
Why sodium is used in photoelectric effect?
A sodium photoelectric surface with work function 2.3eV is illuminated and emits electrons . The electrons travel toward a negatively charged cathode and complete a circuit. ... I used 6.8eV for E because the electron had 4.5eV when it ejected and it overcame the 2.3eV work function for sodium.
Which metal is best for photoelectric effect?
So, among the given options, cesium has the lowest ionization potential and hence it is best suitable for photoelectric effect. It is a soft, silvery-gold alkali element that is quickly attacked by air and reacts explosively with water. It occurs in the environment mainly due to erosion and weathering of rocks.
What is the work function of sodium?
| Element Work Function(eV) | Silver 4.26-4.73* | Sodium 2.28, 2.36** | Uranium 3.6 | Zinc 4.3 |
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Which metals are suitable for photoelectric effect and why?
Alkali metals having very low ionization energy so it will be very easy to eject an electron. That’s why they are most suitable for photoelectric effect. Hope it’s helpful.
How do you calculate the photoelectric effect?
The photoelectric effect is the process in which EM radiation ejects electrons from a material. Einstein proposed photons to be quanta of EM radiation having energy E = hf , where f is the frequency of the radiation.
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.
Which metal has highest work function?
The highest known metal work function is approximately 6.35 eV for platinum (Pt) and lowest work function is 2.14eV for cesium. Work function can be said as the minimum energy needed to move an electron from the Fermi level into vacuum.
Do all metals show photoelectric effect?
Experimental observation of photoelectric emission. Even though photoemission can occur from any material, it is most readily observed from metals and other conductors .
What is the best material for photoelectric emission why?
Semiconductors like silicon, cadmium telluride, gallium arsenide and copper indium diselenide are the best material for photoelectric emission. Generally, for the photoelectric effect, materials with low work function are used so that electrons can be emitted from the material by a photon of very low energy.
What metal has a work function of 3.7 eV?
5 A frequency of 2.4 x 10 15 Hz is used on magnesium with work function of 3.7 eV.
What is the formula for work function of a metal?
Their formula is W=−εF+Ws , where εF is the Fermi energy, a quantity determined by the density of electrons and the properties of the crystal lattice of the metal; you can work out reasonable approximations to this for alkali metals by using the free electron approximation.
Is sodium a Natrium?
| Sodium | History | Discovery and first isolation Humphry Davy (1807) | Symbol “Na”: from New Latin natrium, coined from German Natron, ‘natron’ | Main isotopes of sodium |
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Why alkali metals are suitable for photoelectric effect?
The work function of alkali metals is quite low (e.g. for potassium, it is 2.3 eV and for sodium is 2 eV). As a result, they show photoelectric effect even with visible light. For this reason, alkali metals are most suited for photoelectric emission.
Can non metals show photoelectric effect?
Explanation: Photoelectric effect is only for first group elements even for not all elements.So it doesn’t shown by non-metals also . In this effect valence electrons ejected from the photometal when light is abosorbed by that metal. Metals only show the free valance electrons.
Who discovered photoelectric effect?
This became known as the photoelectric effect, and it would be understood in 1905 by a young scientist named Albert Einstein .
