How much heavier is an alpha particle than an electron?

What three things determine the shape and size of a puddle when water is poured out onto a surface

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.