When light waves are allowed to pass through two openings in a barrier, a screen far away shows alternating light and dark lines. What TWO properties of
light waves
explain this?
Interference, transverse , energy, Dopper effect, Diffraction, resonance 

Check the following equation for dimensional homogeneity: ⅆ mv=∫t1t2(f⁢cosθ)ⅆt where m is mass, v is velocity, f is force, θ is an angle, and t is time. check that each term in the equation has the following dimensions: [malbec] where you are to choose the coefficients a, b, c.