The majority of the mass of the atom is located in the a) nucleus b) core electrons c) pions and quarks d) valence electrons

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Which of the following units is not an official si unit

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate