Which among the following elements is used in devising photo electric cells?
Which among the following elements is used in devising photo electric cells?
K
Cs
Ba
Be
Solution
Cesium (Cs) is widely used in the construction of photoelectric cells due to the following reasons:
Cesium has a low ionization energy, making it easy to release electrons when exposed to light.
It is highly photo-sensitive, which is ideal for converting light energy into electrical energy in photoelectric cells.
Other options:
Potassium (K): While it also has low ionization energy, cesium is preferred due to its superior efficiency.
Barium (Ba): Not commonly used for photoelectric purposes.
Beryllium (Be): Not suitable for photoelectric cells.