IB Physics Why does a Satellite not Fall to the Earth?

A tutorial sheet on satellite orbits is given below.

1. A satellite orbits the Earth in a circular path. Is the satellite "falling" towards the Earth?
2. As a satellite orbits the Earth in a circular path does the Earth "fall" away from the satellite?
3. Determine the orbital speed of a geostationary satellite.
4. How far does a geostationary satellite "fall" towards the Earth in one second? How far does the Earth "fall" away from the satellite orbit in one second?

IB Physics Double Slit Interference

A tutorial sheet on Young’s double slit experiment follows.

1. A Young's double slit experiment is carried out with the wavelength much greater than the slit separation. Describe the intensity pattern on a distant screen.
2. In a Young's double slit experiment the wavelength is much less thn the slit separation. Describe the intensity pattern on a distant screen.
3. In a double slit experiment with slits of width b separated by a distance d are all of the maxima on a distant screen of the same intensity?
4. A double slit experiment is carried out with b much less than d. Describe the intensity variation on a distant screen.