Suppose a light ray is changing direction when it changes from one transparent medium to another. which of the following changes would make it change direction even more, to make a path with a greater angle to its original path? (select all that apply) a. change to a higher frequency of light b. move the incident ray to take a direction closer to perpendicular to the interface (closer to the normal line) c. change the second medium to get a greater difference than before in the speed of light in the two mediums d. make the light ray wider

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm