Farah is doing an experiment that involves calculating the speed of a longitudinal wave. what will most likely happen if she increases the temperature in the room?

a) the amplitude of the wave will increase.
b) the amplitude of the wave will decrease.
c) the speed of the wave will increase.
d) the speed of the wave will decrease.

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.