Calculate the wavelength of an electron traveling at 2.70×10^7 m/s

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Asolid that forms and separates from a liquid mixture is called

What must occur for air masses to form fronts