Which of the following phenomena did scientists use as supporting evidence that electromagnetic energy (eg. light) behaves like a wave? 1) EM waves can travel through vacuum 2) the Doppler Effect 3) the interference of waves 4) wave diffraction Question 11 options: answers 1) and 4) only answers 2), 3) and 4) only answers 2) and 3) only all answers were used to provide supporting evidence answers 1), 2) and 3) only