Which of the following best describes radiation? A. A specific wavelength of energy that can be natural or man-made. B. Particles or waves emitted from an atom. C. Dangerous energy emitted from man-made nuclear power sources. D. The unstable nucleus of an atom.

c. just like in xray machines

Explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e