4. A typical compact disc stores information in tiny pits on the disc's surface. A typical pit size is 1.2 x 106 m. What is the frequency of electromagnetic waves that have a wavelength equal to
the typical CD pit size?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

More solar radiation is absorbed by earth’s surface than by

Arrange the images in order to show how lake-effect snow occurs.