I'll give Branliest to the most efficient and first answer. 1. What major change in our thinking about the path of a moving electron had to be made with the advent of quantum theory?

2. Calculate the wavelength of a space shuttle with a mass of 2.05 x 107kg traveling at a rate of 7.85 x 103 m/s. ​

1. The Heisenberg uncertainty principle states that the exact position and momentum of an electron cannot be simultaneously determined. This is because electrons simply don't have a definite position, and direction of motion, at the same time! We know the direction of motion.

I am confused about the second one.

Explanation:

Hope this helps sorry i couldn't figure out the 2 one.