1 Problems with light as a Understand why the 3.2.2.1 Threshold frequency; ATj Use a light source to 8.1, 8.3, 8.4 wave photoelectric effect photon explanation of threshold investigate the diffraction of light demonstrates that light does frequency The photoelectric effect is not always behave as a wave demonstrated and the UV Work function ϕ catastrophe is described, as Explain the terms ‘threshold evidence for the need of a frequency’ and ‘work function’ new model of light. Appreciate that line spectra are also evidence for a particle model of light 2 Determining the Planck Convert between eV and J 3.2.2.2 The electronvolt MS 0.1, 2.3 Substitute numerical 8.3 constant values into calculations using Carry out an investigation and Students will be expected to be appropriate units Students carry out an work out the uncertainties in able to convert eV into J and vice experiment to determine the measurements versa. MS 0.2 Recognise and use Planck constant using the expressions in decimal and Decide on the most sensible voltage that just turns on an standard form graph to plot LED. PS 3.2 Process and analyse data using appropriate mathematical skills ATf Correctly construct circuits where polarity is important 3 The photoelectric equation MS 2.2 Change the subject of an equation Students use the photoelectric equation and Understand the photoelectric MS 3.1 Translate information consider how the kinetic equation, between graphical, numerical and energy of the photoelectrons 3.2.2.1 Photoelectric equation: algebraic forms Understand what is meant by a can be found. stopping potential in a Ek (max) is the maximum kinetic MS 3.4 Determine the slope and 8.4 photoelectric experiment and energy of the photoelectrons intercept of a linear graph 4 Another way to find the the usefulness of it Planck constant Stopping potential PS 1.2 Apply scientific knowledge Observe a photoelectric to practical contexts Students determine the experiment using a photocell Planck constant using PS 3.1, 3.2 Plot and interpret stopping potential data, graphs using appropriate which may be onbtained mathematical skills
1 Problems with light as a wave The photoelectric effect is demonstrated and the UV catastrophe is described, as evidence for the need of a new model of light. Understand why the photoelectric effect demonstrates that light does not always behave as a wave Explain the terms ‘threshold frequency’ and ‘work function’ Appreciate that line spectra are also evidence for a particle model of light 3.2.2.1 Threshold frequency; photon explanation of threshold frequency Work function ϕ ATj Use a light source to investigate the diffraction of light 8.1, 8.3, 8.4 2 Determining the Planck constant Students carry out an experiment to determine the Planck constant using the voltage that just turns on an LED. Convert between eV and J Carry out an investigation and work out the uncertainties in measurements Decide on the most sensible graph to plot 3.2.2.2 The electronvolt Students will be expected to be able to convert eV into J and vice versa. MS 0.1, 2.3 Substitute numerical values into calculations using appropriate units MS 0.2 Recognise and use expressions in decimal and standard form PS 3.2 Process and analyse data using appropriate mathematical skills ATf Correctly construct circuits where polarity is important 8.3 3 The photoelectric equation Students use the photoelectric equation and consider how the kinetic energy of the photoelectrons can be found. Understand the photoelectric equation, Understand what is meant by a stopping potential in a photoelectric experiment and the usefulness of it Observe a photoelectric experiment using a photocell 3.2.2.1 Photoelectric equation: Ek (max) is the maximum kinetic energy of the photoelectrons Stopping potential MS 2.2 Change the subject of an equation MS 3.1 Translate information between graphical, numerical and algebraic forms MS 3.4 Determine the slope and intercept of a linear graph PS 1.2 Apply scientific knowledge to practical contexts PS 3.1, 3.2 Plot and interpret graphs using appropriate mathematical skills 8.4 4 Another way to find the Planck constant Students determine the Planck constant using stopping potential data, which may be onbtained
Physics%20SoW%20Year%201.docx