The ph scale measures the concentration of hydroxide ions. true or false

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Carbon 14 is a naturally occurring stable

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?