Noise-canceling headphones often utilize the wave behavior of interference to make the music you want to hear louder and the noises around you silent. Using your understanding of interference, explain how this would be possible​

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.