Platinum (Pt)

Practice

Practice platinum

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

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

   Light of wavelength $205\ \mathrm{nm}$ shines on a clean platinum surface. The work function of platinum is $\phi = 5.65\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). What is the maximum kinetic energy of the ejected electrons, in J?

   Your answer (in the unit shown)

   $\mathrm{J}$

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

   CheckDifferent question

2. Question 2Photoelectric threshold and work functionExam level

   The work function of platinum is $\phi = 5.65\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). What is the threshold frequency, in $\mathrm{s^{-1}}$, for the photoelectric effect in platinum?

   Your answer (in the unit shown)

   $\mathrm{s^{-1}}$

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

   CheckDifferent question

3. Question 3Will these photons eject electrons?Exam level

   The work function of platinum is $\phi = 5.65\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). Which of these wavelengths of light will eject electrons from platinum? Select all that apply.

   A$195\ \mathrm{nm}$B$165\ \mathrm{nm}$C$530\ \mathrm{nm}$D$210\ \mathrm{nm}$E$565\ \mathrm{nm}$

   CheckDifferent question