AP 2 Modern Physics

Front

Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased. What changes occur?

Back

Rate of electron emission: increase. Energy of electrons: no change.

Front

The photoelectric effect only occurs if the light shining on the metal is:

Back

above a minimum frequency.

Front

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals. Plank's constant is determined by:

Back

the gradient.

Front

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals. The threshold frequency is determined by:

Back

the x-intercept.

Front

Which statement about the photoelectric effect is correct? Options: Electrons are emitted instantaneously., Electrons are not emitted below a certain wavelength., You can change the energy of the electrons by changing the intensity., Electron energy is independent of frequency.

Back

Electrons are emitted instantaneously.

Front

The photoelectric effect is when:

Back

One incident photon releases one electron from a metal.

Front

Maximum kinetic energy of electrons emitted from cesium (Cs) when light of frequency 10¹⁵ Hz falls upon the metal (work function for Cs is 1.8 eV).

Back

2.34 eV

Front

Does high-frequency or low-frequency light cause the ejection of a greater number of electrons from a metal surface?

Back

only high frequency

Front

Do the photons of violet light or the photons of red light, falling on a metal surface with the same intensity, cause emission of more electrons?

Back

violet light

Front

The cut-off wavelength for the photoelectric effect of platinum is 220 nm. Find the work function of platinum in eV.

Back

5.65 eV