What visible wavelengths will be constructively reflected if the film is surrounded by air on both sides?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Which type of wave can travel without a medium