What is the phase difference between two standing waves at a node? 1) 0 2) 180. 3) 90 4)360

Explain your reasoning/ draw a diagram

Which notation is used to represent an alpha particle? a. b. c. d.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

What is similar between metals and suspensions