(0.4 points) compute the interplanar spacings for the (110) and (211) families of planes in α-fe. when an x-ray diffraction pattern of pure α-fe is obtained using x-rays with wavelength 0.15418 nm, at what values of the diffraction angle 2θ do the firstorder peaks appear?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.