Use the KEmax-versus-frequency graph. What is the threshold frequency for this metal?

Use the graph. With $h=6.63\times 10^{-34}$ J*s, what is the work function of the metal?

On a KEmax-versus-frequency graph for the photoelectric effect, what physical quantity is represented by the slope of the straight line?

The graph shows one metal. If it is replaced by a metal with a larger work function, how would the KEmax-versus-frequency line change?

Use the graph. What is the work function of the metal?

Use the graph. Which frequency is the threshold frequency?

Using the graph, what is the slope of the KEmax-versus-frequency line?

Use the graph. What is KEmax when the light frequency is $8.0\times 10^{14}$ Hz?

In the graph, what does the magnitude of the negative vertical intercept represent?

Use the graph. What is KEmax for light of frequency $9.0\times 10^{14}$ Hz?

In the apparatus, ultraviolet light produces a current. It is replaced by red light below the metal's threshold frequency and made much brighter. What does the meter read?

In the apparatus, the light frequency stays above threshold, but the intensity is doubled. What should the meter show?

A filter in the apparatus lowers the incident light from above threshold to below threshold while the lamp remains bright. What happens at the meter?

In the apparatus, the photon rate stays about the same but the frequency is increased above threshold. What meter change is most likely?

Light of frequency $9.00\times 10^{14}$ Hz strikes a metal with work function $3.70\times 10^{-19}$ J. If $h=6.63\times 10^{-34}$ J·s, what is KEmax?

A metal has work function $5.00\times 10^{-19}$ J. Light of frequency $1.20\times 10^{15}$ Hz hits it. With $h=6.63\times 10^{-34}$ J·s, find KEmax.

Light of frequency $8.00\times 10^{14}$ Hz ejects electrons with $K{E}_{\text{max}}=1.30\times 10^{-19}\text{J}$. Using $h=6.63\times 10^{-34}$ J·s, what is the work function?

Light of frequency $6.50\times 10^{14}$ Hz hits a metal with work function $4.60\times 10^{-19}$ J. With $h=6.63\times 10^{-34}$ J·s, what happens?

A photon of frequency $1.50\times 10^{15}$ Hz ejects an electron from a metal with work function $6.20\times 10^{-19}$ J. What is KEmax if $h=6.63\times 10^{-34}$ J·s?

Electrons leave a surface with $K{E}_{\text{max}}=8.00\times 10^{-20}\text{J}$ when light of frequency $7.50\times 10^{14}$ Hz is used. Find the work function.

Light of frequency $5.80\times 10^{14}$ Hz strikes a metal whose work function is $3.20\times 10^{-19}$ J. With $h=6.63\times 10^{-34}$ J·s, what is KEmax?

Light of frequency $1.00\times 10^{15}$ Hz ejects electrons with $K{E}_{\text{max}}=2.00\times 10^{-19}\text{J}$. Using $h=6.63\times 10^{-34}$ J·s, what is the work function?

A metal's work function is $2.50\times 10^{-19}$ J. Light of frequency $4.90\times 10^{14}$ Hz shines on it. With $h=6.63\times 10^{-34}$ J·s, find KEmax.

Light of frequency $1.10\times 10^{15}$ Hz hits a metal with work function $4.40\times 10^{-19}$ J. With $h=6.63\times 10^{-34}$ J·s, what is KEmax?

A dim ultraviolet lamp ejects electrons instantly, but a very bright red lamp ejects none from the same metal. What does this show?

A lamp above threshold is made brighter without changing its color. Which quantity increases most directly?

Green light is just below a metal's threshold frequency. Why will waiting longer not eventually eject electrons?

Blue light ejects faster electrons than yellow light from the same metal, even when the yellow light is brighter. Why?

Which observation is hardest to explain with a purely classical wave model of light?

Light above a metal's threshold frequency ejects electrons with $K{E}_{\text{max}}=2.0\times 10^{-19}\text{J}$. The intensity is doubled and the frequency is unchanged. What is the new KEmax?

A metal emits electrons under violet light but not under orange light. What is the best explanation?

Why is the threshold frequency different for different metals?

A student says, 'If we make below-threshold light bright enough, each photon gets more energy.' What is the correction?

When frequency increases above threshold while intensity is fixed, what happens to KEmax?

What is the threshold frequency in the photoelectric effect?

What is a metal's work function?

Albert Einstein received the 1921 Nobel Prize in Physics especially for work on which effect?

In the photon energy equation E = hf, what is h?

What did Robert Millikan's photoelectric measurements help establish?

Which equation gives the energy of one photon of frequency f?