What are three properties of electromagnetic waves?
a. they travel slower than the speed of light, they include visible light waves, and they can transfer energy through empty space.
b. they need matter through which to travel, they travel at the speed of light, and they include visible light waves.
c. they travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space.
d. they include ultraviolet waves, they need matter through which to travel, and they travel slower than the speed of light.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

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.