Question

Which colors will eject electrons when they strike sodium, which has a frequency threshold of 5.7 × 1014 Hz?

Answer 1

The answer is Violet and Green.

Answer 2

Green, Blue and Violet colors.

Step-by-step explanation:

Due to the photoelectric effect, a material emits electrons if electromagnetic radiation falls on it, usually visible light or ultraviolet rays. The frequency of the electromagnetic radiation must be greater than the frequency threshold of the material in order to photoelectric effect take place. Colors that have a greater frequency than
`5.7*10^(14) Hz` are:

Green: Between
`5.26*10^(14) Hz` and
`6.06*10^(14) Hz`

Blue: Between
`6.06*10^(14) Hz` and
`6.68*10^(14) Hz`

Violet: Between
`6.68*10^(14) Hz` and
`7.89*10^(14) Hz`