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Q. A wooden artifact is found in an ancient tomb. Its carbon-14(146C) activity is measured to be64.0% of that ina fresh sample of wood from the same region. Assuming the sameamount of 14C was initially present in the wood fromwhich the artifact was made, determine the age of the artifact.

Q. The surface of the Sun has a temperature of about 5 800 K. The radius of the Sun is 6.96 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity of the Sun is 0.986.

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