It takes 4 hr 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. what is the half-life of radium-230? a) 1 hr 4 min b) 1 hr 17 min c) 1 hr 33 min d) 1 hr 49 min eli

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

Which component of the earth’s atmosphere is decreased due to photosynthesis?

Which of the following statement is false