Lecture 4. Understanding Electromagnetic Radiation 1.5-1.7 30-Aug Assigned HW 1.1, 1.16, 1.20 1.21, 1.22, 1.23, 1.24, 1.33, 1.36 Due: Monday 6-Sept. Review 1.2-1.4. Waves transmit energy Electromagnetic Radiation Electric Field Magnetic Field
Understanding Electromagnetic Radiation
1.1, 1.16, 1.20 1.21, 1.22, 1.23, 1.24, 1.33, 1.36
Due: Monday 6-Sept
The wavelength of light needed to eject an electron from hydrogen is 91.2 nm. Calculate the velocity of the particle ejected when 80.0 nm light is shone on a sample of hydrogen.
These experiments verify that for each element, discreet amounts of energy are required to eject an electron, φ, which corresponds to a difference between two well defined energy levels
Requires a physical interaction between the photon and another particle
This other particle is released with a specific hν
Linear momentum (kg m s-1)
1937 Nobel Prize was awarded for this discovery
Quantum Mechanical Interpretation
Yes, I rock the bowtie like a champ!
Schrödinger also had a cat.
Why is this value never negative?
What would a negative value indicate?
Wake up and insert answer
Example: If ψ2 = 0.5 pm-3, calculate the probability of finding a particle in a sphere with a radius of 1pm.
which is often expressed as
but what does this mean?
Allowed wavelengths are:
Much easier than it looks, isn’t it?