The ratio of carbon-14 to nitrogen-14 in an artifact is 1:7. Given that the half- life of carbon-14 is 5730 years, how old is the artifact?
A. 5730 years
B. 22,920 years
C. 11,460 years
D. 17,190 years

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount