Calculate the mean free path of a sputtered atom in an ar glow discharge at 10 mtorr pressure. if the cathode-to-substrate spacing is 5cm, how many gas-phase collisions is a sputtered atom likely to encounter as it traverses this distance? kt / (21/2.d2-p), where d is the collision diameter of the molecule: -0.4nm for most molecules and a has cm unit

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

How can you increase the strength of an electromagnet?