The minimum amount of energy required to liberate a photo electron from the metal surface is called as `"____________"`.

Fill in the blanks in the following sentences with appropriate words: The minimum amount of energy required to emit an electron from a metal surface is called ________ .

The energy required to emit an electron from the surface of a metal is called

The minimum energy required to ejected an electron from the surface of a metal is called............ .

The minimum amount of energy required the most loosely bounded electron is called