Consider the X ray diffraction on a cubic crystal. If the two greatest Bragg angles in which peaks of intensity of the diffracted rays can be observed are theta1 = 66.3° and theta2 = 75.3°, what is d ?

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."