Which of the following is NOT a safety precaution that should be practiced at home? A. unplugging electrical appliances not in use B. storing flammable materials in a cool place C. turning off the television at night D. not overloading outlets Please select the best answer from the choices provided. A B C D

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