What would be the effect on the nucleus of an atom if it emitted one alpha and then one beta particle?
a decrease of two in atomic number and a decrease of four in mass number
a decrease of one in atomic number and a decrease of four in mass number
a decrease of one in atomic number and an increase of one in mass number
an increase of one in atomic number and a decrease of two in mass number

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.