A) Compare the difference in the forces of impact for each of two helmets dropped form the same height in figure 2, and explain what this difference suggests about the amount of time the force is applied to each helmet during the collision. Keep in mind that each helmet has the same mass and that the crash pads slow down the helmets as they hit. You may use equation Fat = mav to support your answer?​

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Place me with this question is my last question

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?