Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other II. The waves must have the same frequency III. The waves must have the same amplitude IV. The waves must travel with the speed of light A. I, II, III and IV B. I, II and III only C. I and II only D. II, III and IV only E. I, II and IV only I need explaination for your answers. Any help will be appreciated immensly. Thanks!
Interference is only seen in waves. To interfere the sources don't have to be close together, nor have the same frequency or amplitude, and the speed of light is only relevant for light sources. For instance, widely separated sources of sound will interfere with each other if they have different frequencies (or spectra), which is more noticeable if they have roughly equal amplitudes. They will interfere regardless of amplitudes though. Finally, the speed of sound is a lot less than the speed of light in any medium. So none of the choices is true.
