A current density of 8.50 10-13 A/m2 exists in the atmosphere at a location where the electric field is 143 V/m. Calculate the electrical conductivity of the Earth's atmosphere in this region.

Why is the use of carbon-14 limited

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

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