Which of the following frequencies falls in the range of rf waves used by commercial radio broadcasting stations?

a. 6,000,000 hz
b. 6,000 hz
c. 60 hz
d. 600,000 hz
i don't know which answer some says is a and some says
pl

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

In one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).