Physics

todo: modern physics (famous experiments); go through the real multiple tests

Electrostatics

• Capacitance
• Two conductors, one charged and the other uncharged, have the same charge after touching if and only if they have the same size.

Critical angle: http://en.wikipedia.org/wiki/Total_internal_reflection#Critical_angle

Thermal Expansion

Waves

• on fundamental frequency
• transverse wave traveling towards a fixed end, a rigid object, will be reflected back on the opposite side of the string from the incident pulse. Speed, amplitude constant.
• doppler effect
• Light: electromagnetic wave, mechanical?
• longitudinal wave: sound; not easily polarized
• transverse wave: electromagnetic; can be polarized

Thermaldynamics

• Work done on the gas: W = -P * (delta V)

Fluids

• In Bernoulli's equation, h_1 and h_2 are relative heights (relative to a zero height point).

Optics

• radius of curvature = 2f
• magnification: h_i / h_o = d_i / d_o

Modern Physics

• K_{max} = hf - \phi; \phi: work function of the metal surface.
• eV = K_{max}; V: stopping potential; 2005 Q7
• this is because the definition of 1eV is the work required to move a charge e through a potential difference V.
• energy of a particular photon: E = hf.
• momemtum of a photon: p = mv = h / lamda.
• rest energy of a particle: E = mc^2.
• mass defect: mass of reactants - mass of products
• In nuclear reactions:
• If energy occurs, number of neutrons & protons is not conserved, only charge is conserved;
• If energy does not occur, those & charge are conserved.
• beta particles: atomic number -1, atomic mass number 0.
• gamma ray: no mass.
• famous experiments
• frequency: UV > visible > IR; therefore in terms of levels of energy states, UV < visible < IR (the higher the energy states, the lower the frequencys)

Last Minute Review

1. thin film interference
2. electric potential
3. double slit
4. estimate focal length of a converging lens (2007 Q6): focus the image of the distant tree to a screen, and the focal length is approximately the distance between the lens and the image.
• for the typical graph problem, sometimes we need not choose 2 points of the best-fit line. 1 point may be sufficient.

Corrections

• Quantum transitions that result in the characteristic sharp lines of the X-ray spectrum always involve: the inner electron shells.

Created Date: Mar 20, 2011 18:42:49
Last Modified: Apr 27, 2011 8:36:51