15 multiple choice questions
1. protons are concentrated in a small area at the center of an atom: he discovered the nucleus.
a. atomic mass number
b. rutherford's model
c. subatomic particles
d. bohr's model
2. an uncharged particle in the nucleus mass: 2,000
a neutron
b. nucleus
c. proton

Which sound characteristic is not affected by the relative motion of an object

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.