Question

what must be the main features of metal used for photoelectric emission ?

Answer 1

The photoelectric effect is the emission of electrons or other free carriers when light shines on a material. Electrons emitted in this manner can be called photo electrons. This phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.

Answer 2

Explanation:

• Metal which are very sensitive to light are very essential to photoelectric emission.
• This involves the making a device based on photoelectric effect.
• The metal emits the photoelectrons when radiation of known frequency falls on metal.
• The metal used includes caesium, potassium.
• The alkali metals are used to have “low ionisation enthalpy” and hence it show the ‘photoelectric effect’ to the “maximum extent” and there used for photoelectric cell.
• Cesium has lowest ionization enthalpy and hence used to show better photoelectric effect.