A deuteron of mass M is moving at speed v before colliding with an immobile α-particle of mass 2M. The deuteron is deviated 90° from its initial direction. Knowing that the collision is elastic, determine the angle of the trajectory of the α-particle with respect to the deuteron’s initial path.

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?