Photoelectric effect

Front

What is the photoelectric effect?

Back

The photoelectric effect is the phenomenon where electrons are emitted from a material when it absorbs light (photons) of sufficient energy.

Front

What is the work function in the context of the photoelectric effect?

Back

The work function is the minimum energy required to remove an electron from the surface of a metal.

Front

If the energy of incident photons is less than the work function, what happens?

Back

No electrons are emitted from the metal surface.

Front

What happens to the kinetic energy of ejected electrons if the energy of incident photons exceeds the work function?

Back

The kinetic energy of the ejected electrons is equal to the energy of the photons minus the work function.

Front

What is the relationship between wavelength and energy of photons?

Back

The energy of a photon is inversely proportional to its wavelength; shorter wavelengths correspond to higher energy.

Front

What is the cut-off wavelength in the photoelectric effect?

Back

The cut-off wavelength is the maximum wavelength of light that can cause the emission of electrons from a material.

Front

How does increasing the intensity of light affect the photoelectric effect?

Back

Increasing the intensity of light increases the number of photons hitting the surface, which can increase the number of emitted electrons, but does not affect their kinetic energy.

Front

What is the significance of the threshold frequency in the photoelectric effect?

Back

The threshold frequency is the minimum frequency of light required to eject electrons from a metal surface.

Front

What is the equation that relates the energy of a photon to its frequency?

Back

E = hf, where E is energy, h is Planck's constant, and f is frequency.

Front

What happens to the speed of emitted electrons if the wavelength of light is increased while still emitting electrons?

Back

The speed of the emitted electrons decreases as the wavelength increases.