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Physics 30 Final
Question | Answer |
---|---|
Cavendish | Discovered hydrogen |
Ohm | Found direct proportionality between potential difference (voltage) applies across a conductor and the resultant electric current. Ohm's Law |
Kirchhoff | Found the sum of currents in a network of conductors meeting at a point is zero. Found that in closed circuits, the sum of voltages in the closed system is zero. KIrchhoff's circuit laws. |
Oersted | Discovered electric currents create magnetic fields. |
Faraday | Discovered electromagnetic induction, electrolysis, diamagnetism. |
Lenz | Lenz's Law: An electric current induced by a changing magnetic field will flow such that it will create its own magnetic field that opposes the magnetic field that created it. |
Maxwell | Formulated classical theory of electromagnetic radiation (electricity, magnetism, light). |
Hertz | Proved existence of electromagnetic waves. |
Thomson | Discovered the electron. |
Millikan | Determined charge of single electron. |
Planck | Originated quantum theory. |
Einstein | Developed general theory of relativity. |
Rontgen | Produced and detected first X-Rays. |
Compton | Discovered Compton effect, which demonstrates the particle nature of electromagnetic radiation. |
de Broglie | Postulated that all matter has wave properties. |
Becquerel | Discovered radioactivity. |
Rutherford | Discovered radioactive half-life. |
Balmer | Developed formula for the visible spectral lines of hydrogen atoms. |
Newton | Laws of Motion, F = ma, Action leads to opposite action |
Lyman | Created hydrogen spectral series. |
Paschen | Paschen series, series of hydrogen spectral lines in infrared region. |
Brackett | Brackett series, series where electrons jumps up or drops down to fourth fundamental level. |
Bohr | Bohr model, proposed energy levels of electrons are discrete and revolve around nucleus, but can jump from one level to another. |
Schrodinger | Formulated wave equation, Schrodinger's Cat. |
F = ma | Used for forces acting on an accelerating object. |
F = mg | Used for forces acting on an object subject to gravity. |
p = mv | Used for momentum of a moving object. |
W = Fd | Used for work done on an object. |
Ep = mgh | Used for potential energy of a raised object subject to gravity. |
V = IR | Used for potential difference in Volts from current in Amps and resistance in Ohms. |
P = IV | Used for mechanical power from current in Amps and potential difference in Volts. |
P = hf/c | Used for momentum of a photon from Planck constant, frequency, and the speed of light. |
v = d/t | Used for velocity from distance over time. |
a = vf-vi/t | Used for acceleration from final velocity and initial velocity over time. |
d = vi*t+1/2at^2 | Used for distance from initial velocity, time, and acceleration. |
v = 2pir/T | Used for velocity from radius and period. |
vf^2 = vi^2 + 2ad | Used for final velocity from initial velocity, acceleration, and distance. |
ac = v^2/r | Used for centripetal acceleration from velocity and radius. |
Ft = mv | Used for force and change in time from momentum and velocity. |
Ff = µFN | Used for force of friction from friction coefficient and normal force. |
Fs = -kx | Used for spring force from spring constant and displacement. |
Fg = Gm1m2/r^2 | Used for gravitational force from Gravitational Constant, two masses, and distance between the masses. |
g = Gm1/r^2 | Used for gravity from Gravitational Constant, mass, and radius. |
Fc = mv^2/r | Used for centripetal force from mass, velocity, and radius. |
Fc = (4pi^2mr)/T^2 | Used for centripetal force from mass, radius, and period. |
P = W/t = E/t | Used for power from work over change in time, or change in energy over time. |
Ek = 1/2mv^2 | Used for kinetic energy from mass and velocity. |
Ep = 1/2kx^2 | Used for potential energy from spring constant and displacement |
W = E = Fdcostheta | Used for work from change in energy, or force, distance, and cos theta. |
Fe = kq1q2/r^2 | Used for electromagnetic force from Coulomb's constant, the charges of two objects, and the distance between those objects. |
|E| = kq1/r^2 | Used for absolute energy from Coulomb's constant, the charge of one object, and radius. |
E = Fe/q | Used for energy from electromagnetic force and charge on an object. |
|E| = V/d | Used for absolute energy from potential difference over distance. |
V = E/q | Used for potential difference from energy over charge. |
I = q/t | Used for electric current from charge over time. |
Fm = ILB | Used for magnetic force from electric current, circuit length, and magnetic field strength. |
Fm = qvB | Used for magnetic force from charge, velocity, and magnetic field strength. |
V = LvB | Used for potential difference from circuit length, velocity, and magnetic field strength. |
hf = Ek+W | Used for Planck Constant and frequency from max kinetic energy and work. |
W = hf | Used for work from Planck Constant and frequency. |
E = hf = hc/lambda | Used for energy from Planck Constant and frequency or Planck Constant, speed of light, and wavelength. |
1/lambda = RH(1/nf^2-1/ni^2) | Used for one over wavelength from electrical resistance, magnetic field strength, and principal quantum numbers. |
E = mc^2 | Used for energy from mass and the speed of light. |
p = h/lambda | Used for momentum of a photon from Planck's Constant and wavelength. |