Select the following correct MC answer for the questionspertaining to the Photoelectric Experiment

1. The quantized nature of photon energy is confirmed by thephotoelectric effect since

Select one:

a. only the right number of photons hitting the metal surfaceconsecutively will cause electron ejection.

b. only a photon carrying the right amount energy will eject anelectron from the metal surface.

c. only light of the highest intensity will be able to causeelectron ejection.

d. any photon, regardless of the energy it carries, will be ableto eject an electron.

2. In the photoelectric effect experiment we use a Hg lamp toshine a light on a metal surface encased inside a photocell. One ofthe things we observe is that the energy of electrons ejected fromthe metal surface is independent of the intensity of light thatshines on that surface. In practice this means that

Select one:

a. if we don’t move the lamp at all the photoelectric effectcannot take place.

b. if we move the lamp further away from the photocell than thephotocurrent (amount of ejected electrons) will increase.

c. if we move the lamp closer to the photocell nothing willhappen to the photocurrent (amount of ejected electrons).

d. if we move the lamp closer to the photocell we will increasethe photocurrent (amount of ejected electrons) without increasingindividual electron’s energy.

3. In the photoelectric effect experiment we use a Hg lamp toshine a light on a metal surface encased inside a photocell. Thereare multiple filters mounted on the front of the photocell to helpus separate the light from the lamp into single-wavelength beams.Which of the following statements is true?

Select one:

a. Knowing the wavelength of the incoming photons does not helpus determine the energy of the ejected electrons.

b. Even if we had monochromatic light source, we would stillneed filters to separate its constituent wavelengths.

c. Without the filters the photoelectric effect cannotoccur.

d. Without the filters the photoelectric effect will stillhappen, but we will have no way to determine which electron wasejected by which photon wavelength.

4. The sign (positive or negative) on the value of the workfunction gives us an indication of the direction of energy flowbetween the metal surface (the system) and the environment aroundit (the surroundings) during the photoelectric effect. The sign onthe work function is interpreted from the point of view of thesystem (the metal surface). For example, if the work function ispositive the energy is flowing into the system from thesurroundings (i.e. the energy of the system is increasing). Whichof the following statements is true?

Select one:

a. We expect the work function to be positive, because energymust be given to the system for an electron to be ejected.

b. We expect the work function to be positive, because energymust be released by the system for an electron to be ejected.

c. We expect the work function to be negative, because energymust be released by the system for an electron to be ejected.

d. We expect the work function to be negative, because energymust be given to the system for an electron to be ejected.