If the wavelength of yellow light is 800 nm, what is the frequency of yellow light in Hertz?

Word equation for k(s) +h2o(l) yield koh (aq) + h2

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.