Photoelectric Effect

Front

What is the photoelectric effect?

Back

The photoelectric effect is the phenomenon where electrons are emitted from a material (usually a metal) when it is exposed to light of sufficient frequency.

Front

What is the work function?

Back

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

Front

How is the work function related to frequency?

Back

The work function can be calculated using the equation: Work Function (Φ) = h * f, where h is Planck's constant and f is the frequency of the incident light.

Front

What is the threshold frequency?

Back

The threshold frequency is the minimum frequency of light required to emit electrons from a material.

Front

What happens if the frequency of light is below the threshold frequency?

Back

If the frequency of light is below the threshold frequency, no electrons will be emitted, regardless of the intensity of the light.

Front

What is the maximum kinetic energy of emitted electrons?

Back

The maximum kinetic energy (KE) of emitted electrons can be calculated using the equation: KE = hf - Φ, where hf is the energy of the incident photons.

Front

What is the relationship between wavelength and frequency?

Back

Wavelength (λ) and frequency (f) are inversely related: c = λ * f, where c is the speed of light.

Front

What is the cut-off wavelength?

Back

The cut-off wavelength is the maximum wavelength of light that can cause the photoelectric effect in a material.

Front

How do you calculate the work function from cut-off wavelength?

Back

The work function can be calculated using the equation: Φ = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the cut-off wavelength.

Front

What is Planck's constant?

Back

Planck's constant (h) is a fundamental constant used in quantum mechanics, approximately equal to 6.626 x 10^-34 Js.