1. which type of metal did rutherford shoot alpha particles into?
a)copper b)zinc c)gold d)platinum 2.when thomson held a positively charged plate near the cathode ray, the beam bent toward the plate. what conclusion can be drawn from this observation?
a)the beam was made of light. b)the beam was positively charged. c)the beam was negatively charged. d)the beam was made of neutrons. hat was observed during rutherford's experiment? a)all of the particles were deflected. b)all of the particles went through the foil undeflected.
c)the particles were absorbed by the foil. d)most of the particles went through the foil, but some were deflected.
my answers- 1. c 2. c 3. d

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.