What is refraction?
a. a light wave bounces back after hitting a barrier
b. a light wave passes through a different medium, making an object appear bent
c. a light wave passes through or is absorbed by a medium (opaque, translucent,
transparent)

True or false graphs must include scales that increase by the same amount

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: