X-ray diffractiorn suppose the hypothetical element unobtanium has a single electron, which is bound in a cubic volume of side length 2r, centred about the nucleus. within this volume, the electron density is perfectly uniform, and zero outside. (a) derive an expression for the electron density within the material. it may be piecewise linear. (2 mark) (b) derive the atomic form factor of unobtanium. (5 marks) (c) if unobtainium were organised in a primitive cubic lattice of unit cell side length 2r, what would the diffraction pattern look like? note that this atom has very unusual properties, so may warrant careful thought.

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

Asap 1. which surface feature of the moon is characterized by mountainous areas? question options: maria terrae regolith craters 2.which statement describes surface features called maria on the moon? question options: layers of dust and rock deep areas of cooled lava deep, rocky and barren valleys highlands and mountainous areas

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass