Physics 30 Scientists and Their Discoveries

Cavendish

Torsion balance- Gravitational force

Coulomb

Torsion balance - Electric force

Cavendish

Torsion balance- Gravitational force

Coulomb

Torsion balance - Electric force

Oersted

Compass over carrying wire- Moving charges create magnetic field

Faraday

Moving a conductor through a magnetic field produces a current in the conductor

Lenz

The force on the moving magnet (produced by the the current induced) opposes the applied force

Planck

Blackbody radiation-Blackbody is a perfect absorber/radiator of EMR

Photons - EMR travels in bundles of energies E=nhf

Dalton

Sphere model of the atom

Thomson

Mass Spectrometer and cathode rays

• the e were passing undeflected Eq=qvB

• He found the q/m ration by equating fm=fc

• q/m was the same no matter what metal

Raisin bun model of the atom

Millikan

Oil drop experiment

• found the elementary charge -able to calculate m of and electron

Rutherford

Scattering gold foil

• neutron in the middle, electrons in the outside

• planetary model -problem

Galileo

lanterns on mountains -failed at measuring speed of light

Roemer

attempted to measure c using Jupiter's moon

Michelson

8 sided mirror

Maxwell

EMR is produced by accelerating charges which create a magnetic field and an electric field

Bohr

Energy levels -electrons are allowed to orbit at certain radii -e can drop/go up and emit/ absorb photon

Hertz

Produced and detected EMR waves

Einstein

EMR AS PARTICLES Photoelectric effect -energy of e = energy of photon -work function

Mass equivalence

• E = mc^2

Compton

• scattered wavelength

• momentum

de Broglie

PARTICLES HAVE WAVE PROPERTIES the e must complete a whole # of wavelengths as it orbits the nucleus wavelength = h/mv