Asample has a 14c6 activity of 0.0031 bq per gram of carbon.

(a) find the age of the sample, assuming that the activity per gram of carbon in a living organism has been constant at a value of 0.23 bq.
(b) evidence suggests that the value of 0.23 bq might have been as much as 22% larger. repeat part (a), taking into account this 22% increase.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

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?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n