Which statement best describes how protons were discovered?
a They were observed under a powerful microscope.
b
They were measured using strong magnets to
separate the charges within the atom.
с
A cathode ray tube experiment revealed the
existence of negatively charged particles.
A cathode ray tube revealed a ray of positive
d particles traveling in the opposite direction of
negative electrons.

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.