How does friction affect moving objects?

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

The heliocentric and the geocentric models of the solar system included these central principles