The scanning-tunneling microscope works on the principle of electron tunneling. imagine you are trying to optimize your scanning tunneling microscope. your microscope has a gold tip (work function = 5.1 ev) and your electron has a kinetic energy of 4.6 ev (a) if you move the tip to sample distance from 0.3 nm to 0.2nm how does the transmission probability change? (b) you have a “brilliant” idea. what if you use protons instead of electrons? how will the transmission probability change?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Explain why you think this diagram shows what happened to the carbon in the biodome.

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.