The distance between a proton and an electron is cut in half how does the force of attraction change

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

What is similar between metals and suspensions

What is the relationship between globular clusters and the milky way?