What are two radioactive isotopes that are useful for dating rocks that are older than 10 million years ?

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

State the right hand rule of the direction of magnetic field in a conductor carrying current

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.