The reference point in motion is:
A. the point in space and time at which the motion ended.
B. the focal point.
C. the point in space and time at which the motion began.
D. the origin.

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

What element breaks down into yttrium-90?

Which of the following electromagnetic waves can create ions?