Johannes kepler is known for which discovery in astronomy?
discovering planets around other stars
determining planetary laws of motion
recording 20 years of data about planetary motion
proposing the heliocentric model of the solar system

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Contains chemical energy. a. heat b. light c. natural gas

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