What are 2 examples of stress the science meaning

Which of these conditions most likely produces an unstable isotope?

Which three statements represent the benefits of performing experiments using computer simulations?

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.