An oil film floats on a water surface. the indices of refraction for water and oil, respectively, are 1.333 and 1.466. if a ray of light is incident on the air-to-oil surface at an angle of 37.0º with the normal, what is the angle of the refracted ray in the water?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?

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