3.1 and 3.2 Flashcards
the law of conservation of mass
the weight of the reagents equals the mass of the products
Dalton’s theory of the atom
atoms are the smallest solid indivisible units of matter which explain conservation of mass
what was the first subatomic particle to be invented
the electron
what experiment was used to find the electron
passing a high voltage electric current through a gas electrons pass between electrodes
who found the mass/charge ratio of the electron
J.J. Thompson
how was the charge of an electron found
X-rays ionise the air
the electrons released are attracted to positive plate and slows the rate of fall
how was the charge/mass ratio of the electron found
applying electric and magnetic fields to a beam of electrons and use the deviation
who found the neutron and when
James Chadwick 1932
how was the orbital structure of the atom found
shoot alpha particles at gold sheet
some deflected some bounce back
who found the orbital structure of the atom
Rutherford
equation for speed of light and wavelength
c = lamda v
speed of light = wavelength x frequency
what is wavelength
the distance between two wave crests
define amplitude
the high of the wave crest
define frequency
the number of wave crests which pass through the origin every second
units for frequency
hertz
does red light have a higher or lower frequency than violet light
lower
equation for energy of a photon
E = hv energy = plancks constant x frequency
what is the photoelectric affect
when ultraviolet radiation over a certain frequency threshold hits a metal electrons are ejected
how does the photoelectric affect provide evidence for light as a particle
the electrons are only ejected if each individual particle has enough energy to eject it you can’t keep adding the energy and eventually the electrons come off
define wave particle duality of light
light is considered both a wave and a particle
does diffraction give evidence for light as a particle or a wave
a wave
does destructive and constructive interference give evidence for light as a particle or a wave
a wave
Thomas Young’s experiment on light as a wave
cut two slit
send light through
it has light and dark strips
showing constructive and destructive interference
