An electron that has velocity v = (2.0 x 106 m/s)i +(3.0
x 106 m/s) j moves through the uniform magneticfield b =
(0.30 t)i - (0.15 t)j.
a) find the force on the electron.
b) repeat your calculation for a proton having the
samevelocity.

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3