Thursday 15 February 2024

Week 4 Term 1 2024

 Homework:

  • Activity 11A, p.188-189 Waves & Photons
  • Activity 11B, p.192 Photoelectric Effect
  • Exercise 5B, p.205-208 Photoelectric Effect
  • Ex 5C, p.212-215 Photoelectric Effect
  • Act 11C, p.196 Atomic Line Spectra
  • Act 11D, p.200-201 Bohr Model of Hydrogen Atom
  • Ex 5D, p.221-222 Atomic Models
  • Ex 5E, p.228-230 Atomic Line Spectra
  • Activity 12 A, p.194, Mass-Energy Equivalence
  • Activity 12B, p.213-214, Nuclear Reactions

Nuclear Reaction E = mc2

Nuclear Chemistry Part 1

Nuclear Chemistry Part 2


Binding Energy per Nucleon

Binding Energy per Nucleon is a negative energy or a debt of energy. This is the amount of energy it would take to liberate a nucleon from the nucleus. This energy was originally radiated off when the nucleus formed.

The energy radiated off, the Binding energy, is lost energy and comes from mass that is lost by the nucleons. Mass per Nucleon shows what is left over once a bound nucleon has radiated away some of its mass.




Fission:The breaking up of a larger nucleus into smaller daughter nuclei. Anything above Iron will radiate off energy.

Fusion:

The joining of smaller nuclei into a larger nucleus. Anything below Iron will radiate off energy.


Fission & Fusion


Fission

Wednesday 7 February 2024

Week 2 Term 1 2024

 

Homework:

  • Activity 11A, p.188-189 Waves & Photons
  • Activity 11B, p.192 Photoelectric Effect
  • Exercise 5B, p.205-208 Photoelectric Effect
  • Ex 5C, p.212-215 Photoelectric Effect
  • Act 11C, p.183 Atomic Line Spectra
  • Act 11D, p.188-189 Bohr Model of Hydrogen Atom
  • Ex 5D, p.221-222 Atomic Models
  • Ex 5E, p.228-230 Atomic Line Spectra

Photoelectric Effect

Photoelectric Effect A-Level Physics



H
ertz and Lenards Observation of Photoelectric Effect


Photoelectric Effect

The concept of the Photoelectric Effect was introduced and how light modeled as a particle can explain this, while light modeled as a wave cannot.

The above video explains the Photoelectric Effect using a PhET application which I encourage you to use and experiment with.
This can be found at:

Planck's Constant h = 6.63 x 10-34 Js

Energy of a Photon E = hf

Threshold Frequency fo , the frequency of incident photons that have an energy equal to the work function of the metal

Work Function φ = energy required to free an electron from a specific metal (J)

Maximum Kinetic EnergyEk,  of a freed electron by an incident photon:
Ek = hf - φ



Electron Volts to Joules Conversion



How Quantum Mechanics Saved Physics From Ovens






Planck's Constant - Sixty Symbols


How Quantum Mechanics Saved Physics From Ovens



Planck's Constant - Sixty Symbols




Atomic Line Spectra

Hydrogen Emission and Absorption Spectra for the visible Balmer Series


Atomic Line Spectra for Hydrogen

Emission & Absorption Lines for Hydrogen


Emission Lines for Hydrogen

Bohr Model of the Hydrogen Atom

 Bohr Model of the atom and Atomic Emission Spectra


Line Spectra & the Bohr Model

Emission and Absorption Line Spectra




Energy Levels


Bohr Model of the Hydrogen Atom



Atomic Spectroscopy Explained


Fine Structure Constant 1/137