A sound wave passes from air into water and then into steel. With each change in medium, what happens to the speed of the wave?
А
It increases
B
It decreases. C
It increases then decreases
D
It decreases then increases

Why does the input force have to be greater than the force needed to lift the bale?

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b. refraction c. diffraction d. interference

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?