An ultraviolet photon ( 58 4 nm) from a helium gas value of the quantum number of the energy level for which the discharge tube is absorbed by a hydrogen molecule that is at energy is equal to at 25 C ( ) for a box 1 nm long, ( ) for rest. Since momentum is conserved, what is the velocity of the a box 10 m long, and ( ) for a box 10 m long. hydrogen molecule after absorbing the photon

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !