Which situation is the best example of translational motion? A: a powered up rocket on the launch pad.

B: an ice skater spinning in place.

C: a soccer ball passed between two players.

D: water molecules in a glass of water.

Please help :)

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?