Physics, 17.10.2019 05:10 buglerboy979

Assume that the rate of decay of a radioactive substance is proportional to the amount of the substance present. the half-life of a radioactive substance is the time it takes for one-half of the substance to disintegrate. carbon dating is often used to determine the age of a fossil. for example, a humanoid skull was found in a cave in south africa along with the remains of a campfire. archaeologists believe the age of the skull to be the same age as the campfire. it is determined that only 22% of the original amount of carbon-14 remains in the burnt wood of the campfire. complete parts (a) through (e) below. (a) estimate the age of the skull if the half-life of carbon-14 is about 5620 years the skull is about years old. round to the nearest whole number as needed.) (d) estimate the age of the skull if the half-life of carbon-14 is about 5610 years and 3% of the original amount of carbon-14 re e burnt the skull is about 28,380 years old round to the nearest whole number as needed.)

Answers: 1

Show answers

Another question on Physics

Physics, 22.06.2019 15:00

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Answers: 1

Answer

Physics, 23.06.2019 06:30

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?

Answers: 2

Answer

Physics, 23.06.2019 06:40

Why does magnet 5 float above magnet 4

Answers: 1

Answer

Physics, 23.06.2019 10:40

4.at 0 ºc, some amount of energy is required to change 1 kg of water from a solid into a liquid. if you had a 2 kg piece of ice, what effect would this have on the amount of thermal energy required to change the water from a solid to a liquid? it would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice. it would still require the same amount of energy to change solid water into liquid water because the entire piece of ice would still gain the same amount of energy in each case. it would require energy to be removed from the 2 kg piece of ice. the larger piece of ice already has more total energy than the smaller piece of ice, so energy must be removed for the ice to become liquid. it would require less energy to change solid water into liquid water because the energy would spread through the ice more quickly and the ice already has a larger total amount of energy because it is larger than a 1 kg piece of ice.

Answers: 1

Answer

You know the right answer?

Assume that the rate of decay of a radioactive substance is proportional to the amount of the substa...

Questions