Modern Physics
Photons, the photoelectric effect, atomic energy levels, matter waves, blackbody radiation and special relativity.
Problems
- Energy of a UV Photon
- Energy of a Photon
- Energy of an Orange Photon
- Double the Wavelength
- Energy of a Blue Photon
- Momentum of a Photon
- Momentum of a Short-Wavelength Photon
- Momentum of Red Light
- Photon Energy in Electronvolts
- Counting Photons
- Photons per Second from a Laser
- Twice the Threshold Frequency
- Threshold Wavelength
- Three Times the Threshold
- Kinetic Energy of the Ejected Electron
- Work Function from a Graph
- Finding the Work Function
- Stopping Potential
- Stopping Potential
- Short-Wave UV on a Metal
- What the Slope Means
- How Many Lines?
- Shortest Wavelength Transition
- Energy of n = 3
- Ionising Hydrogen from n = 4
- The First Excited State
- Energy of the λ₁ Photon
- Which Arrow Gives the Shortest Wavelength?
- Describing Hydrogen's Energy Levels
- A Photon That Cannot Be Emitted
- Ionising Hydrogen from n = 2
- Jumping Straight Down
- Exciting Atoms by Electron Impact
- Exciting Hydrogen to n = 3
- The Lyman-Alpha Photon
- Longest Wavelength
- Orbit Size
- Photoionisation from an Excited State
- The Red Hydrogen Line
- Only 7 V
- Ratio of de Broglie Wavelengths
- Scattered Wavelength
- Same Mass
- Compton Scattering
- Twice as Fast
- Electron Versus Proton
- What Is Conserved?
- Same Energy, Different Mass
- Kinetic Energies from Wavelengths
- Mass Ratio from Energy and Wavelength
- Same Kinetic Energy
- Largest Shift
- Quadrupling the Accelerating Voltage
- Einstein's Two Postulates
- Light Seen from a Rocket
- Three Times Hotter
- A Hotter Blackbody
- Power from a Hotter Body
- The Lorentz Factor
- Temperature of a Blue Star
- A Shorter Spaceship