The shortest wavelength of visible light is approximately 400 nm express the wavelength in centimeters

4x cm

Explanation:

400nm = 400 x m

1m = 100 cm  

400 x m = 400 x x 100 cm

ans : wavelength of light =  4x cm

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.