Quantum Wavelength of An Electron Questionnaire

I’m working on a physics practice test / quiz and need an explanation and answer to help me learn.

1)Compare the quantum wavelength of an electron moving at the speed of light vs. a 0.75kg soccer ball getting kicked into a goal at a speed of 55 mph.

2)How much energy (in joules) would a photon need to ionize a hydrogen atom in the n = 2

state?

a) 1.4 x 10-19 J

b) 5.4 x 10-19 J

c) 9.4 x 10-19 J

d) 13.6 J

3)What would be the distance between central maximum and first bright fringe on a screen 5m away from a Young’s double slit experiment with incident red light of wavelength 700 nm and a 8 micrometer distance between the slits?

a) 11cm

b) 22cm

c) 33cm

d) 44cm