Microwaves have longer wavelength than visible light, and a 20 cm slit is wider than what you would use to observe diffraction from visible light (where the slit would need a width similar to a hair). Microwaves will produce the same type of diffraction pattern as discussed in the background for this Investigation, where the equation

good for her? ? where is the question?

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.