In 1911, hans geiger and ernest marsden (working under ernest rutherford) conducted an experiment involving alpha particles and gold foil that led to the discovery of the nucleus in atoms. the nucleus of an atom accounts for.:
a-most of the size and mass of the atom.
b-very little of the size and mass of the atom.
c-most of the atom's size but very little of its mass.
d-most of the atom's mass but very little of its size.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles

If a computer chip switches off -on-off in 0.015 us, what is the switching time in nanoseconds?