A scientist wants to create a new material using nanotechnology. In which size range will she be working?

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

What was the first instrument to ever record an earthquake?

Why do atoms emit energy of only specific wavelengths