The half-life of radioactive Atoms Refers to A. The time required for half the Atoms in a sample to the decay.

B. The number of atoms in a sample that are radioactive.

C. Half the time required for all the Atoms in a sample to disintegrate.

D. The number of atoms that decay in half a second.

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How many joules of heat are absorbed to raise the temperature of 650 grams of water from 5.00c to it's boiling point, 100c

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.