In 1998, scientists discovered that the expansion of the universe has been accelerating.
what force is causing this phenomena?

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o