Questions from College Physics

Q: A piece of charcoal used for cooking is found at the remains

A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.00-kg sample of carbon from the wood has an activity equal to 5.00 x 102 decays per minute. Find the age of the...

Q: Natural uranium ore contains about 0.720% of the fissile

Natural uranium ore contains about 0.720% of the fissile uranium - 235 isotope. Suppose a sample of uranium ore contains 2.50 x 1028 uranium nuclei. Determine the number of uranium - 235 nuclei in the...

Q: According to one estimate, there are 4.4 x 106

According to one estimate, there are 4.4 x 106 metric tons of world uranium reserves extractable at $130/kg or less. About 0.70% of naturally occurring uranium is the fissionable isotope 235U. (a) Cal...

Q: An all - electric home uses approximately 2.00 x 103

An all - electric home uses approximately 2.00 x 103 kWh of electric energy per month. How much uranium - 235 would be required to provide this house with its energy needs for one year? Assume 100% co...

Q: Seawater contains 3 mg of uranium per cubic meter. (

Seawater contains 3 mg of uranium per cubic meter. (a) Given that the average ocean depth is about 4 km and water covers two - thirds of Earth’s surface, estimate the amount of uranium dissolved in th...

Q: Suppose a deuterium – deuterium fusion reactor is designed to have a

Suppose a deuterium – deuterium fusion reactor is designed to have a plasma confinement time of 1.50 s. Determine the minimum ion density per cubic cm required to obtain a net power output from the re...

Q: The proton – proton cycle responsible for the Sun’s 3.84

The proton – proton cycle responsible for the Sun’s 3.84 x 1026 W power output yields about 26.7 MeV of energy for every four protons that are fused into a helium nucleus. Determine (a) The energy in...

Q: When a star has exhausted its hydrogen fuel, it may fuse

When a star has exhausted its hydrogen fuel, it may fuse other nuclear fuels. At temperatures above 1.0 x 108 K, helium fusion can occur. Write the equations for the following processes. (a) Two alpha...

Q: Particles known as resonances have very short half - lives, on

Particles known as resonances have very short half - lives, on the order of 10-23s. Would you guess that they are hadrons or leptons? Explain.

Q: Find the energy released in the fusion reaction 11H + 12H

Find the energy released in the fusion reaction 11H + 12H ( 23He + (