Ultrafine particles of pure iron were produced by evaporation method and their average sizes estimated are 25, 50, 90, and 120 nm using the laser particle analyzer. assuming that the resultant particles are strain free and the peak broadening detected in the measurement with cu-ka radiation arises only from variation of size of the crystallites, estimate the peak width (the value of fwhm) of the (110) plane detected by using the scherrer equation. lattice constant of pure iron is 0.287 nm.

In a system, when potential energy decreases, then entropy also decreases. true false

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above