Which of the following is x rays not useful for
a inspecting packages
b detecting pipeline cracks
c producing vitamin d
d diagnosing bone fractures

X-rays are not used for producing Vitamin D. (C)

wavelength variability is the right one

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation: