Why red light does not show photoelectric effect?

The minimum frequency required for the photoelectric effect to take place is called threshold frequency. It is not possible see the photoelectric effect with red light, because Red light is of long wavelength, so its energy is low, it is not enough to pull electrons.

Why can some light not eject electrons from metals?

If a photon has an energy at least as big as the work function, the photon energy can be transferred to the electron and the electron will have enough energy to escape from the metal. A photon with an energy less than the work function will never be able to eject electrons.

Why will violet light cause the photoelectric effect but red light wont?

In sodium metal, violet light causes the photoelectric effect but red light does not because photons of violet light have LESS energy than those of red light. Einstein proposed that light consists of PHOTONS, which are quanta of energy that behave like tiny particles.

Why can a dim blue light eject electrons out of a metal but a bright red light Cannot?

The photoelectric effect is the ejection of electrons from a metal surface. Blue light has a higher frequency and therefore a higher energy than red light and can therefore eject electrons from a metal that red light cannot.

Is photoelectric effect possible in red light?

Red light does not eject photoelectrons (even if it is very bright). Green light does eject photoelectrons (even if it is very dim). Blue light ejects photoelectrons with more energy than green light (even if it is very dim).

Do all materials require the same energy photon to eject an electron?

Since the frequency of a photon is directly proportional to its energy, as given by Planck’s formula, the incident photons must have the minimum energy required to eject electrons.

How does the brightness of the light affect the electrons that are emitted?

The energy of a wave depends upon its amplitude, which for light is related to its brightness. This means that brighter light should cause the released electrons to have have more energy (since brighter light has more energy to give) and dimmer light should give them less energy.

How does the photoelectric effect support the particle theory of light?

The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision (one that conserves mechanical energy) between two particles, the photon of light and the electron of the metal.

Why can’t red light detach electrons from a metal surface?

Red light had photons with too little energy to dislodge an electron from its atom. But blue or violet light had photons with quanta large enough to knock the metal electrons into outer space. It all depended on the quantity of energy carried by photon.

Why does violet light eject electrons from a certain photosensitive surface?

Photoemission is possible only when energy of incident photon is more than work function of metal. The given surface will emit electrons with violet light but not with red light. The reason is energy of photon of violet light is more than work function, while red light photon has energy less than work function.