Use the diagram above to answer the question that is written down ( Question 1 ) A and B is reading of voltage across the cell.
C and D is reading of voltage across the resistor​

wavelength divides in half and speed stays the same.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.