Apaleontologist measures the ratio of carbon-14 to carbon-12 in a fossil skull found at a site. what technique is he using and for what purpose?
a. using alpha emission to determine the structure of the skull
b. using radioactive decay to determine the structure of the skull
c. using gamma emissions to date the skull
d. using radioactive decay to date the skull

Which two particles are found in the center of an atom

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?