Photoelectric SPH4U

A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light, which of the following statements are correct? (There could be more than one correct choice.)

• The kinetic energy of the ejected electrons doubles.
• The speed of the ejected electrons doubles.
• The number of electrons ejected per second doubles.
• Twice as many photons hit the metal surface as before.
• None of these things occur.

A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,

• the rate of ejected electrons will decrease and their maximum kinetic energy will increase.
• the rate of ejected electrons will remain the same but their maximum kinetic energy will increase.
• the rate of ejected electrons will increase and their maximum kinetic energy will increase.
• the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.

When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?

• the number of electrons ejected per second
• the maximum kinetic energy of the ejected electrons
• the time lag between the onset of the absorption of light and the ejection of electrons
• the work function of the metal
• All of these

What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10^

• 1.31 × 10^15 Hz
• 2.01 × 10^15 Hz
• 3.01 × 10^15 Hz
• 5.02 × 10^15 Hz
• 6.04 × 10^15 Hz

A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10^

• 0.00 eV
• 0.37 eV
• 0.47 eV
• 0.53 eV

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10^

• 0.62 × 10^-19 J
• 0.21 × 10^-19 J
• 0.36 × 10^-19 J
• 0.48 × 10^-19 J
• 0.33 × 10^-19 J

If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10^

• 2.05 × 10^14 Hz
• 1.02 × 10^14 Hz
• 2.50 × 10^14 Hz
• 3.53 × 10^14 Hz
• 5.92 × 10^14 Hz

When it is struck by 240

• 2.60 eV
• 2.18 eV
• 3.02 eV
• 3.43 eV

What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is 2.28 eV? (c = 3.00 × 10^8 m/s, h = 6.626 × 10^

• 580 nm
• 499 nm
• 633 nm
• 668 nm
• 545 nm

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light? (c = 3.00 × 10^8 m/s, h = 6.626 × 10^

• 350 nm
• 330 nm
• 300 nm
• 380 nm
• 410 nm