The stopping potential for electrons emitted from a surface illuminated by light of wavelength 463 nm is 0.730 V. When the incident wavelength is changed to a new value, the stopping potential is 1.48 V. (a) What is this new wavelength

One splits the atoms and molecules  the other combines them

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.

This ain't even a question. speak english