Revise later
SpaceTo flip
If confident
All Flashcards
What are the differences between light intensity and frequency in the photoelectric effect?
Intensity: Affects the number of emitted electrons. Frequency: Affects the kinetic energy of emitted electrons.
Compare the work functions of Sodium and Copper.
Sodium: Lower work function (easier electron emission). Copper: Higher work function (harder electron emission).
Differentiate between the particle and wave nature of light.
Particle: Light consists of photons with energy E=hf. Wave: Light has frequency, wavelength, and can diffract/interfere.
Compare electron emission above and below the threshold frequency
Above: Electrons are emitted, kinetic energy depends on frequency. Below: No electron emission, regardless of intensity.
Compare the effect of increasing light intensity vs. increasing light frequency on the photoelectric effect.
Increasing Intensity: More electrons emitted, but no change in their kinetic energy. Increasing Frequency: Electrons emitted with higher kinetic energy, provided frequency is above threshold.
What happens when light with a frequency below the threshold frequency strikes a metal?
No electrons are emitted, regardless of the light's intensity.
What is the effect of increasing the frequency of incident light above the threshold frequency?
The maximum kinetic energy of the emitted electrons increases.
What is the effect of increasing the intensity of incident light above the threshold frequency?
The number of emitted electrons increases, but their maximum kinetic energy remains the same.
What happens when a material with a low work function is illuminated with light above its threshold frequency?
Electrons are easily emitted with relatively high kinetic energy.
What is the effect of using a material with a high work function in a photoelectric effect experiment?
A higher frequency of light is required to initiate electron emission.
What is the effect of increasing the frequency of incident light above the threshold frequency?
The maximum kinetic energy of the emitted electrons increases.
What happens if the frequency of incident light is below the threshold frequency?
No electrons are emitted, regardless of the light's intensity.
What is the effect of increasing the intensity of incident light (above threshold frequency)?
More electrons are emitted per unit time (increased current), but their maximum kinetic energy remains the same.
What is the effect of using a material with a higher work function?
A higher threshold frequency is required for electron emission.
What is the effect of shining light on a metal surface?
If the light's frequency is above the threshold frequency, electrons are emitted from the metal surface (photoelectric effect).