Question

is it always possible to see photoelectric effect with red light​

Answer 1

Answer:

Because light behaves like particles rather than a continuous stream, even very high-intensity red light will never be able to overcome an electrons' work function (in this situation), as every individual photon fails to do so.

Answer 2

No, it is not possible to see the photoelectric effect with red light​.

• The energy necessary to rip an electron from its orbital is equal to the electron's work function, which red light photons lack.
• Even very high-intensity red light will never be able to surpass an electron's work function (in this example) since each individual photon fails.
• Because light behaves like a wave, red light can surpass the electron's work function with high intensity or for a long time, demonstrating the particle behaviour of light.