Question

Is it possible to eject electrons from titanium metal using visible light?

Answer 1

Answer: No, it is impossible

Step-by-step explanation:

When we talk about electrons being ejected from a metal, we are talking about the photoelectric effect, which consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.

This is what Einstein proposed with the photoelectric effect:

Light behaves like a stream of particles called photons with an energy
`E`, which has an inverse relation with the wavelength
`\lambda` (this means the smaller
`\lambda` is the higher the energy):

`E=(hc)/(\lambda)`

Where
`h` is the Planck constant and
`c` is the speed of light in vacuum.

On the other hand, it is known titanium metal requires a photon with a minimum energy
`E_(min)=6.94(10)^(-19) J` to emit electrons. This means, we need at least a wavelength
`\lambda=286 nm=286(10)^(-9)m` to fulfill this condition.

Therefore:

Since the wavelength range of visible light is between 400nm and 750nm, aproximately, and 286 nm is not in this range; it is impossible to to eject electrons from titanium metal using visible light.