Which occurrence would contradict the big bang theory?
(A. The percentage of carbon dioxide in Earth’s atmosphere increases. ) (B. Scientists discover that 99% of the universe’s mass is hydrogen.)
(C. A radio telescope detects microwave radiation in space. )
(D. Distant galaxies move progressively farther away from Earth.)

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)