Gold (Au)

Practice

Practice gold

Questions from the course about gold. If you’re signed in, your answers count toward your progress.

1. Question 1Photoelectric effect: kinetic energy of ejected electronsExam level

   Light of wavelength $212\ \mathrm{nm}$ shines on a clean gold surface. The work function of gold is $\phi = 5.10\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). What is the maximum kinetic energy of the ejected electrons, in eV?

   Your answer (in the unit shown)

   $\mathrm{eV}$

   Scientific notation: type 4.86e-7 or 4.86 x 10^-7.

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2. Question 2What holds a solid together?Exam level

   Which of these solids consists of metal cations in a sea of delocalized valence electrons (metallic bonding)?

   Aammonium nitrate ($\ce{NH4NO3}$)Bsilicon ($\ce{Si}$)Cgold ($\ce{Au}$)Dsulfur ($\ce{S8}$)

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3. Question 3Photoelectric threshold and work functionExam level

   The work function of gold is $\phi = 5.10\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). What is the longest wavelength of light, in nm, that can eject electrons from gold?

   Your answer (in the unit shown)

   $\mathrm{nm}$

   Scientific notation: type 4.86e-7 or 4.86 x 10^-7.

   CheckDifferent question